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a in (-oo:+oo)
9*a-(8*a)-(4/5) = 3/10-(1/5) // - 3/10-(1/5)
9*a-(8*a)-(4/5)-(3/10)+1/5 = 0
9*a-8*a-4/5-3/10+1/5 = 0
a-9/10 = 0 // + 9/10
a = 9/10
a = 9/10
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