9+(-x)=12

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



9+(-x)=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

(-1x)+9-12=0

We add all the numbers together, and all the variables

(-1x)-3=0

We get rid of parentheses

-1x-3=0

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

-x=3

x=3/-1

x=-3

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