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u=16-3u
We move all terms to the left:
u-(16-3u)=0
We add all the numbers together, and all the variables
u-(-3u+16)=0
We get rid of parentheses
u+3u-16=0
We add all the numbers together, and all the variables
4u-16=0
We move all terms containing u to the left, all other terms to the right
4u=16
u=16/4
u=4
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