exam Maths Puzzle Numerical Ability

if I need to solve for x how would I work this one out?

-2 (6x - 8) = -20 + (2)(4)

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exam Other Question

Solve, graph and write the solution set in interval notation:

5(4 - 3x) < 7(3 - 4) + 12 find the area of the space enclosed by two concentric circles of radii 15cm & 13cm.