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X in (-oo:+oo)
X/6.25 = 12/85 // - 12/85
X/6.25-(12/85) = 0
X/6.25-12/85 = 0
0.16*X-12/85 = 0 // + 12/85
0.16*X = 12/85 // : 0.16
X = 12/85/0.16
X = 0.88235294
X = 0.88235294
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