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X in (-oo:+oo)
X/7 = 3.8 // - 3.8
X/7-3.8 = 0
1/7*X-3.8 = 0 // + 3.8
1/7*X = 3.8 // : 1/7
X = 3.8/1/7
X = 26.60000053
X = 26.60000053
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