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-6u=-7-7u
We move all terms to the left:
-6u-(-7-7u)=0
We add all the numbers together, and all the variables
-6u-(-7u-7)=0
We get rid of parentheses
-6u+7u+7=0
We add all the numbers together, and all the variables
u+7=0
We move all terms containing u to the left, all other terms to the right
u=-7
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