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b in (-oo:+oo)
6*b+3 = 2*b-13 // - 2*b-13
6*b-(2*b)+3+13 = 0
6*b-2*b+3+13 = 0
4*b+16 = 0 // - 16
4*b = -16 // : 4
b = -16/4
b = -4
b = -4
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