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a in (-oo:+oo)
a/20 = 17/20 // - 17/20
a/20-(17/20) = 0
a/20-17/20 = 0
1/20*a-17/20 = 0 // + 17/20
1/20*a = 17/20 // : 1/20
a = 17/20/1/20
a = 17
a = 17
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