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7u=9+10u
We move all terms to the left:
7u-(9+10u)=0
We add all the numbers together, and all the variables
7u-(10u+9)=0
We get rid of parentheses
7u-10u-9=0
We add all the numbers together, and all the variables
-3u-9=0
We move all terms containing u to the left, all other terms to the right
-3u=9
u=9/-3
u=-3
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