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-9+7u=-2u
We move all terms to the left:
-9+7u-(-2u)=0
We get rid of parentheses
7u+2u-9=0
We add all the numbers together, and all the variables
9u-9=0
We move all terms containing u to the left, all other terms to the right
9u=9
u=9/9
u=1
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