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-10-9u=6+7u
We move all terms to the left:
-10-9u-(6+7u)=0
We add all the numbers together, and all the variables
-9u-(7u+6)-10=0
We get rid of parentheses
-9u-7u-6-10=0
We add all the numbers together, and all the variables
-16u-16=0
We move all terms containing u to the left, all other terms to the right
-16u=16
u=16/-16
u=-1
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