20=-(x-9)

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



20=-(x-9)

We move all terms to the left:

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



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

-(x-9)

We get rid of parentheses

-x+9

We add all the numbers together, and all the variables

-1x+9

Back to the equation:

-(-1x+9)



We get rid of parentheses

1x-9+20=0

We add all the numbers together, and all the variables

x+11=0

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

x=-11

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