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a in (-oo:+oo)
(13*a)/12 = 16/12 // - 16/12
(13*a)/12-(16/12) = 0
(13*a)/12-4/3 = 0
13/12*a-4/3 = 0 // + 4/3
13/12*a = 4/3 // : 13/12
a = 4/3/13/12
a = 16/13
a = 16/13
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