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a in (-oo:+oo)
a/20 = 45/100 // - 45/100
a/20-(45/100) = 0
a/20-9/20 = 0
1/20*a-9/20 = 0 // + 9/20
1/20*a = 9/20 // : 1/20
a = 9/20/1/20
a = 9
a = 9
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