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4u+27=8u-13
We move all terms to the left:
4u+27-(8u-13)=0
We get rid of parentheses
4u-8u+13+27=0
We add all the numbers together, and all the variables
-4u+40=0
We move all terms containing u to the left, all other terms to the right
-4u=-40
u=-40/-4
u=+10
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