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a in (-oo:+oo)
a/5 = a-(1/4) // - a-(1/4)
a/5-a+1/4 = 0
1/4-4/5*a = 0 // - 1/4
-4/5*a = -1/4 // : -4/5
a = -1/4/(-4/5)
a = 5/16
a = 5/16
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