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X in (-oo:+oo)
X/2.5 = 6/30 // - 6/30
X/2.5-(6/30) = 0
X/2.5-1/5 = 0
0.4*X-1/5 = 0 // + 1/5
0.4*X = 1/5 // : 0.4
X = 1/5/0.4
X = 0.5
X = 0.5
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