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4u+5=2u+31
We move all terms to the left:
4u+5-(2u+31)=0
We get rid of parentheses
4u-2u-31+5=0
We add all the numbers together, and all the variables
2u-26=0
We move all terms containing u to the left, all other terms to the right
2u=26
u=26/2
u=13
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