What I would do is change the problem up. Instead of b-9b I would make it -(9b-b). It is still the same problem; you will multiply the number inside the parenthesis be -1. So start with 9b-b. That would equal 8b. So it would change from -(9b-b) to -(8b) so you multiply 8b by negative 1 (-1) to get the answer -8b. -8b is your answer. So b - 9b = -8b
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If you mean: 7b+b+b then it is 9b simplified
10b
9b-13b= -4b -4b = 40 Divide both sides by -4 b = -10
b= 10
If you mean: (3b+7)^2 then it is 9b^2+42b+49