X+7.x=640

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Solution for X+7.x=640 equation: 



X+7.X=640

We move all terms to the left:

X+7.X-(640)=0

We add all the numbers together, and all the variables

8X-640=0

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

8X=640

X=640/8

X=80

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