exam Maths Puzzle Numerical Ability

I am having trouble solving these types of equations such as these below:
9(x+3)=4x-3
-5-(15y-1)=2(7y-16)-y
4x-(9-3x)=8x-1
4(5n-7)=10n+2

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exam Other Question

Let P, Q, R, S and T be points in space

a.) Find an equivalent vector to QT-ST

b.) Find an equivalent vector to PR + RT + QS + SQ + TP + PT + TR The area of a rectangle of length x is given by 3x2 + 5x. Find the width of the rectangle (This requires knowledge of the formula for area of a rectangle)???