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X in (-oo:+oo)
X/(-5)-2.5 = 3.2 // - 3.2
X/(-5)-3.2-2.5 = 0
-1/5*X-5.7 = 0 // + 5.7
-1/5*X = 5.7 // : -1/5
X = 5.7/(-1/5)
X = -28.5
X = -28.5
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