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b in (-oo:+oo)
(1/13)*b = -4.34 // + 4.34
(1/13)*b+4.34 = 0
1/13*b+4.34 = 0 // - 4.34
1/13*b = -4.34 // : 1/13
b = -4.34/1/13
b = -56.41999774
b = -56.41999774
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