-13u-(-8u)=20

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Solution for -13u-(-8u)=20 equation: 



-13u-(-8u)=20

We move all terms to the left:

-13u-(-8u)-(20)=0

We get rid of parentheses

-13u+8u-20=0

We add all the numbers together, and all the variables

-5u-20=0

We move all terms containing u to the left, all other terms to the right

-5u=20

u=20/-5

u=-4

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