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b in (-oo:+oo)
(1/12)*b = 1.8 // - 1.8
(1/12)*b-1.8 = 0
1/12*b-1.8 = 0 // + 1.8
1/12*b = 1.8 // : 1/12
b = 1.8/1/12
b = 21.60000086
b = 21.60000086
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