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-4b+21=8b+12(1-b)
We simplify the equation to the form, which is simple to understand
-4b+21=8b+12(1-b)
Reorder the terms in parentheses
-4b+21=8b+(+12-12b)
Remove unnecessary parentheses
-4b+21=+8b+12-12b
We move all terms containing b to the left and all other terms to the right.
-4b-8b+12b=+12-21
We simplify left and right side of the equation.
b=-9
0=-9
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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