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15=-7b+7+3b
We simplify the equation to the form, which is simple to understand
15=-7b+7+3b
We move all terms containing b to the left and all other terms to the right.
+7b-3b=+7-15
We simplify left and right side of the equation.
+4b=-8
We divide both sides of the equation by 4 to get b.
b=-2
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