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3u-39=u-1
We move all terms to the left:
3u-39-(u-1)=0
We get rid of parentheses
3u-u+1-39=0
We add all the numbers together, and all the variables
2u-38=0
We move all terms containing u to the left, all other terms to the right
2u=38
u=38/2
u=19
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