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obtain explicit solutions from "solve"

I tried to use "solve" but, in the output, the variable of my interest is left implicit

[x3 == 1/6780(27360a + 9618t - sqrt(202500t^2x3^2 + 1464480000a^2 + 541225440at + 17122609t^2 + 22500(528at + 7t^2)x3 - 26040sqrt(324t^2x3^2 + 20736a^2 + 2016at + 49t^2 + 36(528at + 7t^2)x3)(240a + 13t)) - 25sqrt(324t^2x3^2 + 20736a^2 + 2016at + 49t^2 + 36(528at + 7t^2)x3))/t, x3 == 1/6780(27360a + 9618t + sqrt(202500t^2x3^2 + 1464480000a^2 + 541225440at + 17122609t^2 + 22500(528at + 7t^2)x3 - 26040sqrt(324t^2x3^2 + 20736a^2 + 2016at + 49t^2 + 36(528at + 7t^2)x3)(240a + 13t)) - 25sqrt(324t^2x3^2 + 20736a^2 + 2016at + 49t^2 + 36(528at + 7t^2)x3))/t]

Someone can help me? Thank you,

Carlo

obtain explicit solutions from "solve"

I tried to use "solve" but, in the output, the variable of my interest is left implicit

[x3 == 1/6780(27360a 1/6780*(27360*a + 9618t 9618*t - sqrt(202500t^2x3^2 sqrt(202500*t^2*x3^2 + 1464480000a^2 1464480000*a^2 + 541225440at 541225440*a*t + 17122609t^2 17122609*t^2 + 22500(528at 22500*(528*a*t + 7t^2)x3 7*t^2)*x3 - 26040sqrt(324t^2x3^2 26040*sqrt(324*t^2*x3^2 + 20736a^2 20736*a^2 + 2016at 2016*a*t + 49t^2 49*t^2 + 36(528at 36*(528*a*t + 7t^2)x3)(240a 7*t^2)*x3)*(240*a + 13t)) 13*t)) - 25sqrt(324t^2x3^2 25*sqrt(324*t^2*x3^2 + 20736a^2 20736*a^2 + 2016at 2016*a*t + 49t^2 49*t^2 + 36(528at 36*(528*a*t + 7t^2)x3))/t, 7*t^2)*x3))/t, x3 == 1/6780(27360a 1/6780*(27360*a + 9618t 9618*t + sqrt(202500t^2x3^2 sqrt(202500*t^2*x3^2 + 1464480000a^2 1464480000*a^2 + 541225440at 541225440*a*t + 17122609t^2 17122609*t^2 + 22500(528at 22500*(528*a*t + 7t^2)x3 7*t^2)*x3 - 26040sqrt(324t^2x3^2 26040*sqrt(324*t^2*x3^2 + 20736a^2 20736*a^2 + 2016at 2016*a*t + 49t^2 49*t^2 + 36(528at 36*(528*a*t + 7t^2)x3)(240a 7*t^2)*x3)*(240*a + 13t)) 13*t)) - 25sqrt(324t^2x3^2 25*sqrt(324*t^2*x3^2 + 20736a^2 20736*a^2 + 2016at 2016*a*t + 49t^2 49*t^2 + 36(528at 36*(528*a*t + 7t^2)x3))/t]7*t^2)*x3))/t]

Someone can help me? Thank you,

Carlo