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x in (-oo:+oo)
X = 100-((15*x)/100) // - 100-((15*x)/100)
X+(15*x)/100-100 = 0
X+3/20*x-100 = 0 // - X-100
3/20*x = -(X-100) // : 3/20
x = (-(X-100))/3/20
x = 20/3*(100-X)
x = 20/3*(100-X)
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