X+2x-20+x+2x-20=140

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Solution for X+2x-20+x+2x-20=140 equation: 



X+2X-20+X+2X-20=140

We move all terms to the left:

X+2X-20+X+2X-20-(140)=0

We add all the numbers together, and all the variables

6X-180=0

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

6X=180

X=180/6

X=30

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