21x-27=9x-9

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Solution for 21x-27=9x-9 equation: 



21x-27=9x-9

We move all terms to the left:

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

We get rid of parentheses

21x-9x+9-27=0

We add all the numbers together, and all the variables

12x-18=0

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

12x=18

x=18/12

x=1+1/2

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