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X in (-oo:+oo)
X/10.5 = 2.5 // - 2.5
X/10.5-2.5 = 0
0.0952381*X-2.5 = 0 // + 2.5
0.0952381*X = 2.5 // : 0.0952381
X = 2.5/0.0952381
X = 26.24999869
X = 26.24999869
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