x+x+7x+7x=640

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Solution for x+x+7x+7x=640 equation: 



x+x+7x+7x=640

We move all terms to the left:

x+x+7x+7x-(640)=0

We add all the numbers together, and all the variables

16x-640=0

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

16x=640

x=640/16

x=40

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