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