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u+42=3u+26
We move all terms to the left:
u+42-(3u+26)=0
We get rid of parentheses
u-3u-26+42=0
We add all the numbers together, and all the variables
-2u+16=0
We move all terms containing u to the left, all other terms to the right
-2u=-16
u=-16/-2
u=+8
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