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X in (-oo:+oo)
X/20 = 35/15 // - 35/15
X/20-(35/15) = 0
X/20-7/3 = 0
1/20*X-7/3 = 0 // + 7/3
1/20*X = 7/3 // : 1/20
X = 7/3/1/20
X = 140/3
X = 140/3
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