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X in (-oo:+oo)
X/(-4) = -1.9 // + 1.9
X/(-4)+1.9 = 0
1.9-1/4*X = 0 // - 1.9
-1/4*X = -1.9 // : -1/4
X = -1.9/(-1/4)
X = 7.6
X = 7.6
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