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a in (-oo:+oo)
(5/12)*a = 14/12 // - 14/12
(5/12)*a-(14/12) = 0
(5/12)*a-7/6 = 0
5/12*a-7/6 = 0 // + 7/6
5/12*a = 7/6 // : 5/12
a = 7/6/5/12
a = 14/5
a = 14/5
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