(x+9)=(12+9)

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



(x+9)=(12+9)

We move all terms to the left:

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

We add all the numbers together, and all the variables

(x+9)-(21)=0

We add all the numbers together, and all the variables

(x+9)-21=0

We get rid of parentheses

x+9-21=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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