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a in (-oo:+oo)
a/15 = 20/100 // - 20/100
a/15-(20/100) = 0
a/15-1/5 = 0
1/15*a-1/5 = 0 // + 1/5
1/15*a = 1/5 // : 1/15
a = 1/5/1/15
a = 3
a = 3
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