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-2(u-4)=-5u-13
We move all terms to the left:
-2(u-4)-(-5u-13)=0
We multiply parentheses
-2u-(-5u-13)+8=0
We get rid of parentheses
-2u+5u+13+8=0
We add all the numbers together, and all the variables
3u+21=0
We move all terms containing u to the left, all other terms to the right
3u=-21
u=-21/3
u=-7
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