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X in (-oo:+oo)
X/6.2 = 2.1 // - 2.1
X/6.2-2.1 = 0
0.16129032*X-2.1 = 0 // + 2.1
0.16129032*X = 2.1 // : 0.16129032
X = 2.1/0.16129032
X = 13.02000021
X = 13.02000021
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