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4u+18=u+29=u+45
We move all terms to the left:
4u+18-(u+29)=0
We get rid of parentheses
4u-u-29+18=0
We add all the numbers together, and all the variables
3u-11=0
We move all terms containing u to the left, all other terms to the right
3u=11
u=11/3
u=3+2/3
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