X+20+x-40=180

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



X+20+X-40=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

2X-200=0

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

2X=200

X=200/2

X=100

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