120+120+x+x+x=180

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Solution for 120+120+x+x+x=180 equation: 



120+120+x+x+x=180

We move all terms to the left:

120+120+x+x+x-(180)=0

We add all the numbers together, and all the variables

3x+60=0

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

3x=-60

x=-60/3

x=-20

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