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-18=-6+3u
We move all terms to the left:
-18-(-6+3u)=0
We add all the numbers together, and all the variables
-(3u-6)-18=0
We get rid of parentheses
-3u+6-18=0
We add all the numbers together, and all the variables
-3u-12=0
We move all terms containing u to the left, all other terms to the right
-3u=12
u=12/-3
u=-4
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