30-18=x-9

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Solution for 30-18=x-9 equation: 



30-18=x-9

We move all terms to the left:

30-18-(x-9)=0

We add all the numbers together, and all the variables

-(x-9)+12=0

We get rid of parentheses

-x+9+12=0

We add all the numbers together, and all the variables

-1x+21=0

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

-x=-21

x=-21/-1

x=+21

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