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5b+2-b=86
We simplify the equation to the form, which is simple to understand
5b+2-b=86
We move all terms containing b to the left and all other terms to the right.
+5b-1b=+86-2
We simplify left and right side of the equation.
+4b=+84
We divide both sides of the equation by 4 to get b.
b=21
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