20x+-20x-(-3x)+3x+15x-(-13)=-8

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Solution for 20x+-20x-(-3x)+3x+15x-(-13)=-8 equation: 



20x+-20x-(-3x)+3x+15x-(-13)=-8

We move all terms to the left:

20x+-20x-(-3x)+3x+15x-(-13)-(-8)=0

We add all the numbers together, and all the variables

18x-(-3x)+21=0

We get rid of parentheses

18x+3x+21=0

We add all the numbers together, and all the variables

21x+21=0

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

21x=-21

x=-21/21

x=-1

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