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X in (-oo:+oo)
X/12.5 = 0.64 // - 0.64
X/12.5-0.64 = 0
0.08*X-0.64 = 0 // + 0.64
0.08*X = 0.64 // : 0.08
X = 0.64/0.08
X = 8
X = 8
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