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X-(0.2X)=6400
We move all terms to the left:
X-(0.2X)-(6400)=0
We add all the numbers together, and all the variables
X-(+0.2X)-6400=0
We get rid of parentheses
X-0.2X-6400=0
We add all the numbers together, and all the variables
0.8X-6400=0
We move all terms containing X to the left, all other terms to the right
0.8X=6400
X=6400/0.8
X=8000
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