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a in (-oo:+oo)
(1/2)*a-(3/8) = 1/40 // - 1/40
(1/2)*a-(3/8)-(1/40) = 0
(1/2)*a-3/8-1/40 = 0
1/2*a-2/5 = 0 // + 2/5
1/2*a = 2/5 // : 1/2
a = 2/5/1/2
a = 4/5
a = 4/5
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