640-2x-2x-2x=X

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Solution for 640-2x-2x-2x=X equation: 



640-2x-2x-2x=x

We move all terms to the left:

640-2x-2x-2x-(x)=0

We add all the numbers together, and all the variables

-7x+640=0

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

-7x=-640

x=-640/-7

x=91+3/7

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