(x+3)+21=9

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



(x+3)+21=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

(x+3)+12=0

We get rid of parentheses

x+3+12=0

We add all the numbers together, and all the variables

x+15=0

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

x=-15

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