exam Maths Puzzle Numerical Ability

Solve for the unknown variable:
a)sqrt9^x=27
b)8^(1/2x)=(2^7)*(4^9)
c)sqrt125^x=5/25^x Can someone PLEASE help me ???

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exam Other Question
Is --x^2 = x an identity (true for all values of x)? Find three numbers in a GP whose sum is 26 and and product is 216