exam Maths Puzzle Numerical Ability

how would you solve {{{x^2+7/8x-x/8}}} and {{{a+a/5+2/5a}}}

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exam Other Question

Simplify (9x^4y^2y^-8w^0)^1/2 divided by (125x^-6y^-3y^0)^1/3 i have to solve the problems using system of equations..
1.x+y=6 2. 2x-3y=-13
y=2x y=2x+7