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a in (-oo:+oo)
(3/8)*a = 12/40 // - 12/40
(3/8)*a-(12/40) = 0
(3/8)*a-3/10 = 0
3/8*a-3/10 = 0 // + 3/10
3/8*a = 3/10 // : 3/8
a = 3/10/3/8
a = 4/5
a = 4/5
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