book Maths Puzzle Numerical Ability

HELP!! I am struggling in solving this equation. I am never sure on the negative numbers on how to figure.

Solve the following equation by first solving for y: 2x - 3y = 12

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book Other Question

the mesures of two complementary angles are represented by x+5 and 4x-15 find the value of x The width of a rectangle is 1 meter more than half the length of the rectangle. If the perimeter of the rectangle is 110 meters, find the width and the length.