book Maths Puzzle Numerical Ability

Solve for b: 6-3(b+4)=-(2b-6)-(b-1)

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book Other Question

The diagonal of a square television screen measures 18 inches. What is the length of the sides? I need to know if I am right on this question, Find the legal values of b in the fraction.

2b^2+3b-10
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b^2-2b-8

I think the answer is b=-5, -2, 2 and 4