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a in (-oo:+oo)
a/20 = 9.1/40 // - 9.1/40
a/20-(9.1/40) = 0
a/20-0.2275 = 0
1/20*a-0.2275 = 0 // + 0.2275
1/20*a = 0.2275 // : 1/20
a = 0.2275/1/20
a = 4.55
a = 4.55
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