12=x+20+9=40

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Solution for 12=x+20+9=40 equation: 



12=x+20+9=40

We move all terms to the left:

12-(x+20+9)=0

We add all the numbers together, and all the variables

-(x+29)+12=0

We get rid of parentheses

-x-29+12=0

We add all the numbers together, and all the variables

-1x-17=0

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

-x=17

x=17/-1

x=-17

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