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y in (-oo:+oo)
y = 10-2.5*(-5/2) // - 10-2.5*(-5/2)
y-(-2.5*(-5/2))-10 = 0
y-10-6.25 = 0
y-16.25 = 0 // + 16.25
y = 16.25
y = 16.25
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