40+x+x+20=180

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Solution for 40+x+x+20=180 equation: 



40+x+x+20=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-120=0

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

2x=120

x=120/2

x=60

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