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X in (-oo:+oo)
X/3+10/1 = 15 // - 15
X/3+10/1-15 = 0
X/3-15+10 = 0
1/3*X-5 = 0 // + 5
1/3*X = 5 // : 1/3
X = 5/1/3
X = 15
X = 15
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