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y in (-oo:+oo)
y = (0-0.9)/1.4 // - (0-0.9)/1.4
y-((0-0.9)/1.4) = 0
y+0.64285714 = 0
y+0.64285714 = 0 // - 0.64285714
y = -0.64285714
y = -0.64285714
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