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X in (-oo:+oo)
X/5 = 3.4 // - 3.4
X/5-3.4 = 0
1/5*X-3.4 = 0 // + 3.4
1/5*X = 3.4 // : 1/5
X = 3.4/1/5
X = 17
X = 17
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