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a in (-oo:+oo)
(5/8)*a = 1/4 // - 1/4
(5/8)*a-(1/4) = 0
(5/8)*a-1/4 = 0
5/8*a-1/4 = 0 // + 1/4
5/8*a = 1/4 // : 5/8
a = 1/4/5/8
a = 2/5
a = 2/5
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