3x-20=x+20=180

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Solution for 3x-20=x+20=180 equation: 



3x-20=x+20=180

We move all terms to the left:

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

We get rid of parentheses

3x-x-20-20=0

We add all the numbers together, and all the variables

2x-40=0

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

2x=40

x=40/2

x=20

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