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X in (-oo:+oo)
X/7 = 11.2 // - 11.2
X/7-11.2 = 0
1/7*X-11.2 = 0 // + 11.2
1/7*X = 11.2 // : 1/7
X = 11.2/1/7
X = 78.40000157
X = 78.40000157
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