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X in (-oo:+oo)
X/2 = 15/3 // - 15/3
X/2-(15/3) = 0
X/2-5 = 0
1/2*X-5 = 0 // + 5
1/2*X = 5 // : 1/2
X = 5/1/2
X = 10
X = 10
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