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a in (-oo:+oo)
4*a-(1/5) = 9/10 // - 9/10
4*a-(1/5)-(9/10) = 0
4*a-1/5-9/10 = 0
4*a-11/10 = 0 // + 11/10
4*a = 11/10 // : 4
a = 11/10/4
a = 11/40
a = 11/40
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