(x+3)-12=9

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Solution for (x+3)-12=9 equation: 



(x+3)-12=9

We move all terms to the left:

(x+3)-12-(9)=0

We add all the numbers together, and all the variables

(x+3)-21=0

We get rid of parentheses

x+3-21=0

We add all the numbers together, and all the variables

x-18=0

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

x=18

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