exam Maths Puzzle Numerical Ability

Subtract. write in simplest form.
2x/x-3 - 6/x-3

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exam Other Question

A homeowner wishes to insulate her attic with fiber glass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the att (8x^-5)(-2x^3)^4
I am so confused, could someone please explain.