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6(u+7)+3u=-39
We move all terms to the left:
6(u+7)+3u-(-39)=0
We add all the numbers together, and all the variables
3u+6(u+7)+39=0
We multiply parentheses
3u+6u+42+39=0
We add all the numbers together, and all the variables
9u+81=0
We move all terms containing u to the left, all other terms to the right
9u=-81
u=-81/9
u=-9
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