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a in (-oo:+oo)
(7/12)*a = 3/14 // - 3/14
(7/12)*a-(3/14) = 0
(7/12)*a-3/14 = 0
7/12*a-3/14 = 0 // + 3/14
7/12*a = 3/14 // : 7/12
a = 3/14/7/12
a = 18/49
a = 18/49
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