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a in (-oo:+oo)
6*a-(5*a)-(2/5) = 9/10-(1/5) // - 9/10-(1/5)
6*a-(5*a)-(2/5)-(9/10)+1/5 = 0
6*a-5*a-2/5-9/10+1/5 = 0
a-11/10 = 0 // + 11/10
a = 11/10
a = 11/10
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