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-15=20b-9-14b
We simplify the equation to the form, which is simple to understand
-15=20b-9-14b
We move all terms containing b to the left and all other terms to the right.
-20b+14b=-9+15
We simplify left and right side of the equation.
-6b=+6
We divide both sides of the equation by -6 to get b.
b=-1
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