x+2x=x-20

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



x+2x=x-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(x-20)=0

We get rid of parentheses

3x-x+20=0

We add all the numbers together, and all the variables

2x+20=0

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

2x=-20

x=-20/2

x=-10

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