exam Maths Puzzle Numerical Ability

How do u solve for the solutions in the problem

x^2-4x=-8

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exam Other Question

Divide.
(5x^7-3x^4+2x^2-10x+2)÷(x^2-x+1)
Simplify and state any restrictions.
(2x-6)^2/(x^2-4) * (x^2+3x-10)/(2x^2+2x-24) divided by (2x^2+4x-30)/(3x^2+7x-20)