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-12u-11=-4(3u+3)
We simplify the equation to the form, which is simple to understand
-12u-11=-4(3u+3)
Reorder the terms in parentheses
-12u-11=+(-12u-12)
Remove unnecessary parentheses
-12u-11=-12u-12
We move all terms containing u to the left and all other terms to the right.
-12u+12u=-12+11
We simplify left and right side of the equation.
u=-1
0=-1
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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