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72=u+7u
We move all terms to the left:
72-(u+7u)=0
We add all the numbers together, and all the variables
-(+8u)+72=0
We get rid of parentheses
-8u+72=0
We move all terms containing u to the left, all other terms to the right
-8u=-72
u=-72/-8
u=+9
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