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4u-18=u+15
We move all terms to the left:
4u-18-(u+15)=0
We get rid of parentheses
4u-u-15-18=0
We add all the numbers together, and all the variables
3u-33=0
We move all terms containing u to the left, all other terms to the right
3u=33
u=33/3
u=11
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