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3u+15=6u-12
We move all terms to the left:
3u+15-(6u-12)=0
We get rid of parentheses
3u-6u+12+15=0
We add all the numbers together, and all the variables
-3u+27=0
We move all terms containing u to the left, all other terms to the right
-3u=-27
u=-27/-3
u=+9
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