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b in (-oo:+oo)
b+13/2 = (-5*b)/3 // - (-5*b)/3
b-((-5*b)/3)+13/2 = 0
b+(5/3)*b+13/2 = 0
8/3*b+13/2 = 0 // - 13/2
8/3*b = -13/2 // : 8/3
b = -13/2/8/3
b = -39/16
b = -39/16
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