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70=-u+8u
We move all terms to the left:
70-(-u+8u)=0
We add all the numbers together, and all the variables
-(+7u)+70=0
We get rid of parentheses
-7u+70=0
We move all terms containing u to the left, all other terms to the right
-7u=-70
u=-70/-7
u=+10
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