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X in (-oo:+oo)
-6 = 4/5-(7*X) // - 4/5-(7*X)
7*X-(4/5)-6 = 0
7*X-4/5-6 = 0
7*X-34/5 = 0 // + 34/5
7*X = 34/5 // : 7
X = 34/5/7
X = 34/35
X = 34/35
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