X+x-20+x-40=120

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Solution for X+x-20+x-40=120 equation: 



X+X-20+X-40=120

We move all terms to the left:

X+X-20+X-40-(120)=0

We add all the numbers together, and all the variables

3X-180=0

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

3X=180

X=180/3

X=60

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