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b in (-oo:+oo)
5*b+8 = 3*b+12 // - 3*b+12
5*b-(3*b)-12+8 = 0
5*b-3*b-12+8 = 0
2*b-4 = 0 // + 4
2*b = 4 // : 2
b = 4/2
b = 2
b = 2
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