exam Maths Puzzle Numerical Ability

Add: 1/x+2 + 8/x-2?

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exam Other Question

given f(x)=8x-2 and g(x)=2x-3, find f-g I would apprecaite some help with the following :

Simplify

3(m^-3)^-2 nm^3n^-1 / mm^2m^0m^-7(m^3)^3