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

I need help in solving a rational equation.

-5/6x-1 + 623/72x(square)-42x+5 = -8/12x-5
simplify by removing factors of 1

1280v6z4
________

100v3z2

simplified form is?