15+21=-4(9x-9)

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Solution for 15+21=-4(9x-9) equation: 



15+21=-4(9x-9)

We move all terms to the left:

15+21-(-4(9x-9))=0

We add all the numbers together, and all the variables

-(-4(9x-9))+36=0



We calculate terms in parentheses: -(-4(9x-9)), so:

-4(9x-9)

We multiply parentheses

-36x+36

Back to the equation:

-(-36x+36)



We get rid of parentheses

36x-36+36=0

We add all the numbers together, and all the variables

36x=0

x=0/36

x=0

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