x+12=20-x

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Solution for x+12=20-x equation: 



x+12=20-x

We move all terms to the left:

x+12-(20-x)=0

We add all the numbers together, and all the variables

x-(-1x+20)+12=0

We get rid of parentheses

x+1x-20+12=0

We add all the numbers together, and all the variables

2x-8=0

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

2x=8

x=8/2

x=4

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