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y in (-oo:+oo)
y = 4-0.303*(-4/5) // - 4-0.303*(-4/5)
y-(-0.303*(-4/5))-4 = 0
y-4-0.2424 = 0
y-4.2424 = 0 // + 4.2424
y = 4.2424
y = 4.2424
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