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2u+31=5u-5
We move all terms to the left:
2u+31-(5u-5)=0
We get rid of parentheses
2u-5u+5+31=0
We add all the numbers together, and all the variables
-3u+36=0
We move all terms containing u to the left, all other terms to the right
-3u=-36
u=-36/-3
u=+12
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