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X in (-oo:+oo)
X/2 = 47.1 // - 47.1
X/2-47.1 = 0
1/2*X-47.1 = 0 // + 47.1
1/2*X = 47.1 // : 1/2
X = 47.1/1/2
X = 94.2
X = 94.2
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