12+3x+x=2x-20

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Solution for 12+3x+x=2x-20 equation: 



12+3x+x=2x-20

We move all terms to the left:

12+3x+x-(2x-20)=0

We add all the numbers together, and all the variables

4x-(2x-20)+12=0

We get rid of parentheses

4x-2x+20+12=0

We add all the numbers together, and all the variables

2x+32=0

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

2x=-32

x=-32/2

x=-16

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