exam Maths Puzzle Numerical Ability

Is --x^2 = x an identity (true for all values of x)?

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exam Other Question

( 13.0 - 2 3/8 ) + ( 1 1/2 ) / 1.125 x 1.75 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 ???