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-12u-18=-12u-18
We simplify the equation to the form, which is simple to understand
-12u-18=-12u-18
We move all terms containing u to the left and all other terms to the right.
-12u+12u=-18+18
We simplify left and right side of the equation.
u=0
0=0
This equation is an identity, so all real numbers are solutions.
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