x+6x+7x=280

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Solution for x+6x+7x=280 equation: 



x+6x+7x=280

We move all terms to the left:

x+6x+7x-(280)=0

We add all the numbers together, and all the variables

14x-280=0

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

14x=280

x=280/14

x=20

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