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-12=u/2-3
We move all terms to the left:
-12-(u/2-3)=0
We get rid of parentheses
-u/2+3-12=0
We multiply all the terms by the denominator
-u+3*2-12*2=0
We add all the numbers together, and all the variables
-1u-18=0
We move all terms containing u to the left, all other terms to the right
-u=18
u=18/-1
u=-18
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