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b in (-oo:+oo)
5*b-(3*b)-8 = -28 // + 28
5*b-(3*b)-8+28 = 0
5*b-3*b-8+28 = 0
2*b+20 = 0 // - 20
2*b = -20 // : 2
b = -20/2
b = -10
b = -10
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