-21x+18x=3(-9-2x)

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Solution for -21x+18x=3(-9-2x) equation: 



-21x+18x=3(-9-2x)

We move all terms to the left:

-21x+18x-(3(-9-2x))=0

We add all the numbers together, and all the variables

-21x+18x-(3(-2x-9))=0

We add all the numbers together, and all the variables

-3x-(3(-2x-9))=0



We calculate terms in parentheses: -(3(-2x-9)), so:

3(-2x-9)

We multiply parentheses

-6x-27

Back to the equation:

-(-6x-27)



We get rid of parentheses

-3x+6x+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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