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X in (-oo:+oo)
X/(-4) = -1.7 // + 1.7
X/(-4)+1.7 = 0
1.7-1/4*X = 0 // - 1.7
-1/4*X = -1.7 // : -1/4
X = -1.7/(-1/4)
X = 6.8
X = 6.8
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