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9u=-2u+7
We move all terms to the left:
9u-(-2u+7)=0
We get rid of parentheses
9u+2u-7=0
We add all the numbers together, and all the variables
11u-7=0
We move all terms containing u to the left, all other terms to the right
11u=7
u=7/11
u=7/11
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