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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

21x-9x-(3x-9)-27=0

We get rid of parentheses

21x-9x-3x+9-27=0

We add all the numbers together, and all the variables

9x-18=0

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

9x=18

x=18/9

x=2

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