exam Maths Puzzle Numerical Ability

I would appreciate help with the following :

Simplify by adding like terms :

-2^0x^2y^2x^-2 + 3y^2/x^2 - 4x^-2/y^-2 + 5y^2

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exam Other Question

find the soultion to the equation:
6x-3=-2x+21 76. Darren and Douglas must paint the 792 foot fence that encircles their family home. Because Darren is older, he has agreed to paint 20% more than Douglas. How much of the fence will each boy paint?