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-9m+9m=7(m-3)-7(m-12)
We simplify the equation to the form, which is simple to understand
-9m+9m=7(m-3)-7(m-12)
Reorder the terms in parentheses
-9m+9m=+(+7m-21)-7*(m-12)
Remove unnecessary parentheses
-9m+9m=+7m-21-7+*(+m-12+)
Reorder the terms in parentheses
-9m+9m=+7m-21+(-7m+84)
Remove unnecessary parentheses
-9m+9m=+7m-21-7m+84
We move all terms containing m to the left and all other terms to the right.
-9m+9m-7m+7m=-21+84
We simplify left and right side of the equation.
m=+63
0=63
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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