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a in (-oo:+oo)
a-(5/10) = 20-(3/5) // - 20-(3/5)
a-(5/10)+3/5-20 = 0
a-1/2+3/5-20 = 0
a-199/10 = 0 // + 199/10
a = 199/10
a = 199/10
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