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-8u=-11-7u
We move all terms to the left:
-8u-(-11-7u)=0
We add all the numbers together, and all the variables
-8u-(-7u-11)=0
We get rid of parentheses
-8u+7u+11=0
We add all the numbers together, and all the variables
-1u+11=0
We move all terms containing u to the left, all other terms to the right
-u=-11
u=-11/-1
u=+11
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