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X in (-oo:+oo)
X/80 = 3/20 // - 3/20
X/80-(3/20) = 0
X/80-3/20 = 0
1/80*X-3/20 = 0 // + 3/20
1/80*X = 3/20 // : 1/80
X = 3/20/1/80
X = 12
X = 12
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