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-7(u-9)=3u-27
We move all terms to the left:
-7(u-9)-(3u-27)=0
We multiply parentheses
-7u-(3u-27)+63=0
We get rid of parentheses
-7u-3u+27+63=0
We add all the numbers together, and all the variables
-10u+90=0
We move all terms containing u to the left, all other terms to the right
-10u=-90
u=-90/-10
u=+9
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