-20=2(9-x)

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Solution for -20=2(9-x) equation: 



-20=2(9-x)

We move all terms to the left:

-20-(2(9-x))=0

We add all the numbers together, and all the variables

-(2(-1x+9))-20=0



We calculate terms in parentheses: -(2(-1x+9)), so:

2(-1x+9)

We multiply parentheses

-2x+18

Back to the equation:

-(-2x+18)



We get rid of parentheses

2x-18-20=0

We add all the numbers together, and all the variables

2x-38=0

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

2x=38

x=38/2

x=19

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