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16=1+3u
We move all terms to the left:
16-(1+3u)=0
We add all the numbers together, and all the variables
-(3u+1)+16=0
We get rid of parentheses
-3u-1+16=0
We add all the numbers together, and all the variables
-3u+15=0
We move all terms containing u to the left, all other terms to the right
-3u=-15
u=-15/-3
u=+5
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