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7b+3-4b=3+3b-12
We simplify the equation to the form, which is simple to understand
7b+3-4b=3+3b-12
We move all terms containing b to the left and all other terms to the right.
+7b-4b-3b=+3-12-3
We simplify left and right side of the equation.
b=-12
0=-12
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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