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x-x(.2)=217000
We move all terms to the left:
x-x(.2)-(217000)=0
We add all the numbers together, and all the variables
x-x(0.2)-217000=0
We multiply parentheses
x-0.2x-217000=0
We add all the numbers together, and all the variables
0.8x-217000=0
We move all terms containing x to the left, all other terms to the right
0.8x=217000
x=217000/0.8
x=271250
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