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8b-7b-=7-2
We simplify the equation to the form, which is simple to understand
8b-7b-=7-2
We move all terms containing b to the left and all other terms to the right.
+8b-7b=-7-2
We simplify left and right side of the equation.
+1b=-9
We divide both sides of the equation by 1 to get b.
b=-9
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