9=-9(10+x)

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Solution for 9=-9(10+x) equation: 



9=-9(10+x)

We move all terms to the left:

9-(-9(10+x))=0

We add all the numbers together, and all the variables

-(-9(x+10))+9=0



We calculate terms in parentheses: -(-9(x+10)), so:

-9(x+10)

We multiply parentheses

-9x-90

Back to the equation:

-(-9x-90)



We get rid of parentheses

9x+90+9=0

We add all the numbers together, and all the variables

9x+99=0

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

9x=-99

x=-99/9

x=-11

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