book Maths Puzzle Numerical Ability

I would please like your help with this problem: 5x-3(2x-1)=5-3(-x+2)

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book Other Question

The measure of the area of a rectangle is 6a^2+7a+2. The width is a binomial of the form ap+q. What is the measure of the perimeter of the rectangle? Find the roots of the quadratic equation:

z^2 + 5z - 14 = 0