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-6(u-3)=-3u+45
We move all terms to the left:
-6(u-3)-(-3u+45)=0
We multiply parentheses
-6u-(-3u+45)+18=0
We get rid of parentheses
-6u+3u-45+18=0
We add all the numbers together, and all the variables
-3u-27=0
We move all terms containing u to the left, all other terms to the right
-3u=27
u=27/-3
u=-9
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