x-x*0.2=640

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Solution for x-x*0.2=640 equation: 



x-x*0.2=640

We move all terms to the left:

x-x*0.2-(640)=0

Wy multiply elements

x-0.2x-640=0

We add all the numbers together, and all the variables

0.8x-640=0

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

0.8x=640

x=640/0.8

x=800

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