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-9u+63=5u-35
We move all terms to the left:
-9u+63-(5u-35)=0
We get rid of parentheses
-9u-5u+35+63=0
We add all the numbers together, and all the variables
-14u+98=0
We move all terms containing u to the left, all other terms to the right
-14u=-98
u=-98/-14
u=+7
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