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2u+12=3u-1
We move all terms to the left:
2u+12-(3u-1)=0
We get rid of parentheses
2u-3u+1+12=0
We add all the numbers together, and all the variables
-1u+13=0
We move all terms containing u to the left, all other terms to the right
-u=-13
u=-13/-1
u=+13
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