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-12=-b+4b
We simplify the equation to the form, which is simple to understand
-12=-b+4b
We move all terms containing b to the left and all other terms to the right.
+1b-4b=+12
We simplify left and right side of the equation.
-3b=+12
We divide both sides of the equation by -3 to get b.
b=-4
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