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b in (-oo:+oo)
b/5 = 2.2 // - 2.2
b/5-2.2 = 0
1/5*b-2.2 = 0 // + 2.2
1/5*b = 2.2 // : 1/5
b = 2.2/1/5
b = 11
b = 11
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