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a in (-oo:+oo)
-4*a-(1/5) = -201/5 // + -201/5
-4*a-(1/5)-(-201/5) = 0
201/5-4*a-1/5 = 0
40-4*a = 0 // - 40
-4*a = -40 // : -4
a = -40/(-4)
a = 10
a = 10
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