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y in (-oo:+oo)
y = 0.6*(-3/10)-3 // - 0.6*(-3/10)-3
y-(0.6*(-3/10))+3 = 0
y+0.18+3 = 0
y+3.18 = 0 // - 3.18
y = -3.18
y = -3.18
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