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P, emi, rate, duration = var("P emi rate duration")
eq1 = P == emi * (( 1 + rate / 100)^ duration - 1) / (rate / 100) / (1 + rate /100)^ duration
eq2 = eq1.subs(P=100,duration=2,rate=10)
solve(eq2, emi)

Please note the double equal sign ( == ) between P and emi* ...