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x in (-oo:+oo)
p = 100-((5/7)*x) // - 100-((5/7)*x)
p+(5/7)*x-100 = 0
p+5/7*x-100 = 0 // - p-100
5/7*x = -(p-100) // : 5/7
x = (-(p-100))/5/7
x = 7/5*(100-p)
x = 7/5*(100-p)
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