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4u+31=2u+37
We move all terms to the left:
4u+31-(2u+37)=0
We get rid of parentheses
4u-2u-37+31=0
We add all the numbers together, and all the variables
2u-6=0
We move all terms containing u to the left, all other terms to the right
2u=6
u=6/2
u=3
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