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4u+23=8u-13
We move all terms to the left:
4u+23-(8u-13)=0
We get rid of parentheses
4u-8u+13+23=0
We add all the numbers together, and all the variables
-4u+36=0
We move all terms containing u to the left, all other terms to the right
-4u=-36
u=-36/-4
u=+9
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