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a in (-oo:+oo)
(5*a)/12-(a/3) = 12 // - 12
(5*a)/12-(a/3)-12 = 0
1/12*a-12 = 0 // + 12
1/12*a = 12 // : 1/12
a = 12/1/12
a = 144
a = 144
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