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3(u-7)-5u=-39
We move all terms to the left:
3(u-7)-5u-(-39)=0
We add all the numbers together, and all the variables
-5u+3(u-7)+39=0
We multiply parentheses
-5u+3u-21+39=0
We add all the numbers together, and all the variables
-2u+18=0
We move all terms containing u to the left, all other terms to the right
-2u=-18
u=-18/-2
u=+9
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