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b in (-oo:+oo)
13*b-(13/3) = 2*b-5 // - 2*b-5
13*b-(2*b)-(13/3)+5 = 0
13*b-2*b-13/3+5 = 0
11*b+2/3 = 0 // - 2/3
11*b = -2/3 // : 11
b = -2/3/11
b = -2/33
b = -2/33
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