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y in (-oo:+oo)
y = 2.2857*(-5/8)-5 // - 2.2857*(-5/8)-5
y-(2.2857*(-5/8))+5 = 0
y+1.4285625+5 = 0
y+6.4285625 = 0 // - 6.4285625
y = -6.4285625
y = -6.4285625
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