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a in (-oo:+oo)
a/20 = 15/10 // - 15/10
a/20-(15/10) = 0
a/20-3/2 = 0
1/20*a-3/2 = 0 // + 3/2
1/20*a = 3/2 // : 1/20
a = 3/2/1/20
a = 30
a = 30
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