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Y in (-oo:+oo)
Y = -2.8*(7/5)-7 // + -2.8*(7/5)-7
Y-(-2.8*(7/5))+7 = 0
Y+3.92+7 = 0
Y+10.92 = 0 // - 10.92
Y = -10.92
Y = -10.92
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