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X in (-oo:+oo)
20*X = 8/15 // - 8/15
20*X-(8/15) = 0
20*X-8/15 = 0
20*X-8/15 = 0 // + 8/15
20*X = 8/15 // : 20
X = 8/15/20
X = 2/75
X = 2/75
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