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a in (-oo:+oo)
(7/8)*a = 1/3 // - 1/3
(7/8)*a-(1/3) = 0
(7/8)*a-1/3 = 0
7/8*a-1/3 = 0 // + 1/3
7/8*a = 1/3 // : 7/8
a = 1/3/7/8
a = 8/21
a = 8/21
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