1x+2x+(x-20)=180

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Solution for 1x+2x+(x-20)=180 equation: 



1x+2x+(x-20)=180

We move all terms to the left:

1x+2x+(x-20)-(180)=0

We add all the numbers together, and all the variables

3x+(x-20)-180=0

We get rid of parentheses

3x+x-20-180=0

We add all the numbers together, and all the variables

4x-200=0

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

4x=200

x=200/4

x=50

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