book Maths Puzzle Numerical Ability

How do you solve (w-3)-5(w+7)=10(w+3)-(7w+5)?

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book Other Question

Assume that the only area formula you know is the formula for the area of a triangle. Explain how to derive the formula for the area of the trapezoid Solve the proportion please:

y+4/y-1 = 4/3