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X in (-oo:+oo)
X/(-3.5) = -4 // + 4
X/(-3.5)+4 = 0
4-0.28571429*X = 0 // - 4
-0.28571429*X = -4 // : -0.28571429
X = -4/(-0.28571429)
X = 13.99999979
X = 13.99999979
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