x+(x-80)+(x-40)=180

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Solution for x+(x-80)+(x-40)=180 equation: 



x+(x-80)+(x-40)=180

We move all terms to the left:

x+(x-80)+(x-40)-(180)=0

We get rid of parentheses

x+x+x-80-40-180=0

We add all the numbers together, and all the variables

3x-300=0

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

3x=300

x=300/3

x=100

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