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a in (-oo:+oo)
(4/5)*a = 1/25 // - 1/25
(4/5)*a-(1/25) = 0
(4/5)*a-1/25 = 0
4/5*a-1/25 = 0 // + 1/25
4/5*a = 1/25 // : 4/5
a = 1/25/4/5
a = 1/20
a = 1/20
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