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-2+7u=4+4u
We move all terms to the left:
-2+7u-(4+4u)=0
We add all the numbers together, and all the variables
7u-(4u+4)-2=0
We get rid of parentheses
7u-4u-4-2=0
We add all the numbers together, and all the variables
3u-6=0
We move all terms containing u to the left, all other terms to the right
3u=6
u=6/3
u=2
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