book Maths Puzzle Numerical Ability

simplify the rational expresion

6 - 2x
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4x - 12

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book Other Question

What would a written expression to represent the perimeter of a rectangle be?

2x-7 for the width
3x center
x heigth Am doing this right? Is the ordered pair 5,-4 the answer for the following question
which ordered pair is a solution to 3x - 4y = -1
thanks for your help