exam Maths Puzzle Numerical Ability

Plwase help, I am to simplify and all exponents should be positive

Thanks, Lackinmath

(3x4y^3-5y)-(2x+3y^3-5y)

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exam Other Question

Please help me find the inverse of the function.
f(x)= (-5+5x)/(3-x)
use elimination to solve each system of equations

2/3x-1/2y=14
5/6x-1/2y=18