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b-1+b-1+b+3+2b=31
We simplify the equation to the form, which is simple to understand
b-1+b-1+b+3+2b=31
We move all terms containing b to the left and all other terms to the right.
+1b+1b+1b+2b=+31+1+1-3
We simplify left and right side of the equation.
+5b=+30
We divide both sides of the equation by 5 to get b.
b=6
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