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14=3u+4u
We move all terms to the left:
14-(3u+4u)=0
We add all the numbers together, and all the variables
-(+7u)+14=0
We get rid of parentheses
-7u+14=0
We move all terms containing u to the left, all other terms to the right
-7u=-14
u=-14/-7
u=+2
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