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a in (-oo:+oo)
(5/12)*a = 1/3 // - 1/3
(5/12)*a-(1/3) = 0
(5/12)*a-1/3 = 0
5/12*a-1/3 = 0 // + 1/3
5/12*a = 1/3 // : 5/12
a = 1/3/5/12
a = 4/5
a = 4/5
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