3x-12=-20+x

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Solution for 3x-12=-20+x equation: 



3x-12=-20+x

We move all terms to the left:

3x-12-(-20+x)=0

We add all the numbers together, and all the variables

3x-(x-20)-12=0

We get rid of parentheses

3x-x+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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