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I don't know what's hard about it (can't answer that part), but you can use some of the options that solve offers:
sage: solve((x-1)^.5-(2*x-3)^.5-(3*x-4)^.5==0,x,to_poly_solve=True)
[x == (3/2)]
sage: solve((x-1)^(1/2)-(2*x-3)^(1/2)-(3*x-4)^(1/2)==0,x,algorithm='sympy') # note the 1/2
[x == (3/2)]
