20+13u=-20+9u-8

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Solution for 20+13u=-20+9u-8 equation: 



20+13u=-20+9u-8

We move all terms to the left:

20+13u-(-20+9u-8)=0

We add all the numbers together, and all the variables

13u-(9u-28)+20=0

We get rid of parentheses

13u-9u+28+20=0

We add all the numbers together, and all the variables

4u+48=0

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

4u=-48

u=-48/4

u=-12

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