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2b-84+b=84
We simplify the equation to the form, which is simple to understand
2b-84+b=84
We move all terms containing b to the left and all other terms to the right.
+2b+1b=+84+84
We simplify left and right side of the equation.
+3b=+168
We divide both sides of the equation by 3 to get b.
b=56
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