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X in (-oo:+oo)
X/20 = 16/15 // - 16/15
X/20-(16/15) = 0
X/20-16/15 = 0
1/20*X-16/15 = 0 // + 16/15
1/20*X = 16/15 // : 1/20
X = 16/15/1/20
X = 64/3
X = 64/3
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