3=-9+x

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Solution for 3=-9+x equation: 



3=-9+x

We move all terms to the left:

3-(-9+x)=0

We add all the numbers together, and all the variables

-(x-9)+3=0

We get rid of parentheses

-x+9+3=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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