(X-140)*(1-40%)=1/5X
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![(X-140)*(1-40%)=1/5X](/uploads/image/z/1271719-55-9.jpg?t=%28X-140%29%2A%281-40%25%29%3D1%2F5X)
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(X-140)*(1-40%)=1/5X
(X-140)*(1-40%)=1/5X
(X-140)*(1-40%)=1/5X
(X-140)*(1-40%)=1/5X
60%(x-140)=x/5
3/5(x-140)=x/5
3(x-140)=x
3x-420=x
2x=420
x=210
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