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-12=3u+6
We move all terms to the left:
-12-(3u+6)=0
We get rid of parentheses
-3u-6-12=0
We add all the numbers together, and all the variables
-3u-18=0
We move all terms containing u to the left, all other terms to the right
-3u=18
u=18/-3
u=-6
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