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5(u-7)-7u=-39
We move all terms to the left:
5(u-7)-7u-(-39)=0
We add all the numbers together, and all the variables
-7u+5(u-7)+39=0
We multiply parentheses
-7u+5u-35+39=0
We add all the numbers together, and all the variables
-2u+4=0
We move all terms containing u to the left, all other terms to the right
-2u=-4
u=-4/-2
u=+2
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