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4u-42+31=u+46
We move all terms to the left:
4u-42+31-(u+46)=0
We add all the numbers together, and all the variables
4u-(u+46)-11=0
We get rid of parentheses
4u-u-46-11=0
We add all the numbers together, and all the variables
3u-57=0
We move all terms containing u to the left, all other terms to the right
3u=57
u=57/3
u=19
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