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7u-10=9u+10
We move all terms to the left:
7u-10-(9u+10)=0
We get rid of parentheses
7u-9u-10-10=0
We add all the numbers together, and all the variables
-2u-20=0
We move all terms containing u to the left, all other terms to the right
-2u=20
u=20/-2
u=-10
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