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4+15u=17u+16
We move all terms to the left:
4+15u-(17u+16)=0
We get rid of parentheses
15u-17u-16+4=0
We add all the numbers together, and all the variables
-2u-12=0
We move all terms containing u to the left, all other terms to the right
-2u=12
u=12/-2
u=-6
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