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y in (-oo:+oo)
y = 1.1429*(8/7)-8 // - 1.1429*(8/7)-8
y-(1.1429*(8/7))+8 = 0
y-1.30617143+8 = 0
y+6.69382857 = 0 // - 6.69382857
y = -6.69382857
y = -6.69382857
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