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b in (-oo:+oo)
(4/3)*b = -(12/13) // + 12/13
(4/3)*b+12/13 = 0
4/3*b+12/13 = 0 // - 12/13
4/3*b = -12/13 // : 4/3
b = -12/13/4/3
b = -9/13
b = -9/13
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