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-9(u-3)=-4u+42
We move all terms to the left:
-9(u-3)-(-4u+42)=0
We multiply parentheses
-9u-(-4u+42)+27=0
We get rid of parentheses
-9u+4u-42+27=0
We add all the numbers together, and all the variables
-5u-15=0
We move all terms containing u to the left, all other terms to the right
-5u=15
u=15/-5
u=-3
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