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.6(100-u)=39
We move all terms to the left:
.6(100-u)-(39)=0
We add all the numbers together, and all the variables
.6(-1u+100)-39=0
We multiply parentheses
-0.6u+60-39=0
We add all the numbers together, and all the variables
-0.6u+21=0
We move all terms containing u to the left, all other terms to the right
-0.6u=-21
u=-21/-0.6
u=+35
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