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X in (-oo:+oo)
X/2.5 = -1.64 // + 1.64
X/2.5+1.64 = 0
0.4*X+1.64 = 0 // - 1.64
0.4*X = -1.64 // : 0.4
X = -1.64/0.4
X = -4.1
X = -4.1
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