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y in (-oo:+oo)
y = 4.5581*(-5/2)+10 // - 4.5581*(-5/2)+10
y-(4.5581*(-5/2))-10 = 0
y-10+11.39525 = 0
y+1.39525 = 0 // - 1.39525
y = -1.39525
y = -1.39525
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