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10=3-7u
We move all terms to the left:
10-(3-7u)=0
We add all the numbers together, and all the variables
-(-7u+3)+10=0
We get rid of parentheses
7u-3+10=0
We add all the numbers together, and all the variables
7u+7=0
We move all terms containing u to the left, all other terms to the right
7u=-7
u=-7/7
u=-1
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