-x=9(x-20)

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



-x=9(x-20)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(9(x-20)), so:

9(x-20)

We multiply parentheses

9x-180

Back to the equation:

-(9x-180)



We get rid of parentheses

-1x-9x+180=0

We add all the numbers together, and all the variables

-10x+180=0

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

-10x=-180

x=-180/-10

x=+18

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