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-3=2-b-1
We simplify the equation to the form, which is simple to understand
-3=2-b-1
We move all terms containing b to the left and all other terms to the right.
+1b=+2-1+3
We simplify left and right side of the equation.
+1b=+4
We divide both sides of the equation by 01 to get b.
b=4
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