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X in (-oo:+oo)
(7*X)/12 = 5/2 // - 5/2
(7*X)/12-(5/2) = 0
(7*X)/12-5/2 = 0
7/12*X-5/2 = 0 // + 5/2
7/12*X = 5/2 // : 7/12
X = 5/2/7/12
X = 30/7
X = 30/7
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