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y in (-oo:+oo)
y = 4-0.5*(-1/2) // - 4-0.5*(-1/2)
y-(-0.5*(-1/2))-4 = 0
y-4-0.25 = 0
y-4.25 = 0 // + 4.25
y = 4.25
y = 4.25
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