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X in (-oo:+oo)
X/3 = 10/15 // - 10/15
X/3-(10/15) = 0
X/3-2/3 = 0
1/3*X-2/3 = 0 // + 2/3
1/3*X = 2/3 // : 1/3
X = 2/3/1/3
X = 2
X = 2
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