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5u+15=2u+36
We move all terms to the left:
5u+15-(2u+36)=0
We get rid of parentheses
5u-2u-36+15=0
We add all the numbers together, and all the variables
3u-21=0
We move all terms containing u to the left, all other terms to the right
3u=21
u=21/3
u=7
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