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