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-9b+8+7b=3b+13
We simplify the equation to the form, which is simple to understand
-9b+8+7b=3b+13
We move all terms containing b to the left and all other terms to the right.
-9b+7b-3b=+13-8
We simplify left and right side of the equation.
-5b=+5
We divide both sides of the equation by -5 to get b.
b=-1
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