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X in (-oo:+oo)
7*X+5/6 = 5/2 // - 5/2
7*X+5/6-(5/2) = 0
7*X+5/6-5/2 = 0
7*X-5/3 = 0 // + 5/3
7*X = 5/3 // : 7
X = 5/3/7
X = 5/21
X = 5/21
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