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b in (-oo:+oo)
(1/13)*b = -2.37 // + 2.37
(1/13)*b+2.37 = 0
1/13*b+2.37 = 0 // - 2.37
1/13*b = -2.37 // : 1/13
b = -2.37/1/13
b = -30.80999877
b = -30.80999877
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