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X in (-oo:+oo)
X/16 = 4/20 // - 4/20
X/16-(4/20) = 0
X/16-1/5 = 0
1/16*X-1/5 = 0 // + 1/5
1/16*X = 1/5 // : 1/16
X = 1/5/1/16
X = 16/5
X = 16/5
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