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43=3u+16
We move all terms to the left:
43-(3u+16)=0
We get rid of parentheses
-3u-16+43=0
We add all the numbers together, and all the variables
-3u+27=0
We move all terms containing u to the left, all other terms to the right
-3u=-27
u=-27/-3
u=+9
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