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2u-28=5u-40
We move all terms to the left:
2u-28-(5u-40)=0
We get rid of parentheses
2u-5u+40-28=0
We add all the numbers together, and all the variables
-3u+12=0
We move all terms containing u to the left, all other terms to the right
-3u=-12
u=-12/-3
u=+4
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