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3u+3(u+30)=-39
We move all terms to the left:
3u+3(u+30)-(-39)=0
We add all the numbers together, and all the variables
3u+3(u+30)+39=0
We multiply parentheses
3u+3u+90+39=0
We add all the numbers together, and all the variables
6u+129=0
We move all terms containing u to the left, all other terms to the right
6u=-129
u=-129/6
u=-21+1/2
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