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42=14-7u
We move all terms to the left:
42-(14-7u)=0
We add all the numbers together, and all the variables
-(-7u+14)+42=0
We get rid of parentheses
7u-14+42=0
We add all the numbers together, and all the variables
7u+28=0
We move all terms containing u to the left, all other terms to the right
7u=-28
u=-28/7
u=-4
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