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a in (-oo:+oo)
(14*a)/3 = 7/9 // - 7/9
(14*a)/3-(7/9) = 0
(14*a)/3-7/9 = 0
14/3*a-7/9 = 0 // + 7/9
14/3*a = 7/9 // : 14/3
a = 7/9/14/3
a = 1/6
a = 1/6
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