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-15=5b+12-2b
We simplify the equation to the form, which is simple to understand
-15=5b+12-2b
We move all terms containing b to the left and all other terms to the right.
-5b+2b=+12+15
We simplify left and right side of the equation.
-3b=+27
We divide both sides of the equation by -3 to get b.
b=-9
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