13=5x+2(-x+20)

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Solution for 13=5x+2(-x+20) equation: 



13=5x+2(-x+20)

We move all terms to the left:

13-(5x+2(-x+20))=0

We add all the numbers together, and all the variables

-(5x+2(-1x+20))+13=0



We calculate terms in parentheses: -(5x+2(-1x+20)), so:

5x+2(-1x+20)

We multiply parentheses

5x-2x+40

We add all the numbers together, and all the variables

3x+40

Back to the equation:

-(3x+40)



We get rid of parentheses

-3x-40+13=0

We add all the numbers together, and all the variables

-3x-27=0

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

-3x=27

x=27/-3

x=-9

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