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-3(u+4)=8u+13
We move all terms to the left:
-3(u+4)-(8u+13)=0
We multiply parentheses
-3u-(8u+13)-12=0
We get rid of parentheses
-3u-8u-13-12=0
We add all the numbers together, and all the variables
-11u-25=0
We move all terms containing u to the left, all other terms to the right
-11u=25
u=25/-11
u=-2+3/11
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