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X in (-oo:+oo)
X/5 = 1/15-5 // - 1/15-5
X/5-(1/15)+5 = 0
X/5-1/15+5 = 0
1/5*X+74/15 = 0 // - 74/15
1/5*X = -74/15 // : 1/5
X = -74/15/1/5
X = -74/3
X = -74/3
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