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9u-87=u+9
We move all terms to the left:
9u-87-(u+9)=0
We get rid of parentheses
9u-u-9-87=0
We add all the numbers together, and all the variables
8u-96=0
We move all terms containing u to the left, all other terms to the right
8u=96
u=96/8
u=12
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