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x in (-oo:+oo)
Y = (8/5)*x-1 // - (8/5)*x-1
Y-((8/5)*x)+1 = 0
Y+(-8/5)*x+1 = 0
Y-8/5*x+1 = 0 // - Y+1
-8/5*x = -(Y+1) // : -8/5
x = (-(Y+1))/(-8/5)
x = 5/8*(Y+1)
x = 5/8*(Y+1)
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