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X in (-oo:+oo)
X/(-1.7) = -680 // + 680
X/(-1.7)+680 = 0
680-0.58823529*X = 0 // - 680
-0.58823529*X = -680 // : -0.58823529
X = -680/(-0.58823529)
X = 1156.00000809
X = 1156.00000809
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