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b-138=-8b-3
We simplify the equation to the form, which is simple to understand
b-138=-8b-3
We move all terms containing b to the left and all other terms to the right.
+1b+8b=-3+138
We simplify left and right side of the equation.
+9b=+135
We divide both sides of the equation by 9 to get b.
b=15
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