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14=u/3+12
We move all terms to the left:
14-(u/3+12)=0
We get rid of parentheses
-u/3-12+14=0
We multiply all the terms by the denominator
-u-12*3+14*3=0
We add all the numbers together, and all the variables
-1u+6=0
We move all terms containing u to the left, all other terms to the right
-u=-6
u=-6/-1
u=+6
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