-21x+15x=3(-9-3x)

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Solution for -21x+15x=3(-9-3x) equation: 



-21x+15x=3(-9-3x)

We move all terms to the left:

-21x+15x-(3(-9-3x))=0

We add all the numbers together, and all the variables

-21x+15x-(3(-3x-9))=0

We add all the numbers together, and all the variables

-6x-(3(-3x-9))=0



We calculate terms in parentheses: -(3(-3x-9)), so:

3(-3x-9)

We multiply parentheses

-9x-27

Back to the equation:

-(-9x-27)



We get rid of parentheses

-6x+9x+27=0

We add all the numbers together, and all the variables

3x+27=0

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

3x=-27

x=-27/3

x=-9

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