x+x-20=240

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Solution for x+x-20=240 equation: 



x+x-20=240

We move all terms to the left:

x+x-20-(240)=0

We add all the numbers together, and all the variables

2x-260=0

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

2x=260

x=260/2

x=130

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