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-16=-7+u/3
We move all terms to the left:
-16-(-7+u/3)=0
We add all the numbers together, and all the variables
-(u/3-7)-16=0
We get rid of parentheses
-u/3+7-16=0
We multiply all the terms by the denominator
-u+7*3-16*3=0
We add all the numbers together, and all the variables
-1u-27=0
We move all terms containing u to the left, all other terms to the right
-u=27
u=27/-1
u=-27
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