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a in (-oo:+oo)
(5/6)*a = 15/2 // - 15/2
(5/6)*a-(15/2) = 0
(5/6)*a-15/2 = 0
5/6*a-15/2 = 0 // + 15/2
5/6*a = 15/2 // : 5/6
a = 15/2/5/6
a = 9
a = 9
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