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y in (-oo:+oo)
y-4 = (5/2)*(0-1) // - (5/2)*(0-1)
y-((5/2)*(0-1))-4 = 0
y+5/2-4 = 0
y-3/2 = 0 // + 3/2
y = 3/2
y = 3/2
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