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b in (-oo:+oo)
6*b+8 = 2*b-8 // - 2*b-8
6*b-(2*b)+8+8 = 0
6*b-2*b+8+8 = 0
4*b+16 = 0 // - 16
4*b = -16 // : 4
b = -16/4
b = -4
b = -4
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