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X in (-oo:+oo)
X/(-45) = 1/120 // - 1/120
X/(-45)-(1/120) = 0
X/(-45)-1/120 = 0
-1/45*X-1/120 = 0 // + 1/120
-1/45*X = 1/120 // : -1/45
X = 1/120/(-1/45)
X = -3/8
X = -3/8
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