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b in (-oo:+oo)
(b+13)/2 = (-5*b)/3 // - (-5*b)/3
(b+13)/2-((-5*b)/3) = 0
(b+13)/2+(5/3)*b = 0
(b+13)/2+(5*b)/3 = 0
(3*(b+13))/(2*3)+(2*5*b)/(2*3) = 0
3*(b+13)+2*5*b = 0
13*b+39 = 0
(13*b+39)/(2*3) = 0
(13*b+39)/(2*3) = 0 // * 2*3
13*b+39 = 0
13*b+39 = 0 // - 39
13*b = -39 // : 13
b = -39/13
b = -3
b = -3
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