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b in (-oo:+oo)
b-(3*b)+3 = -17 // + 17
b-(3*b)+3+17 = 0
b-3*b+3+17 = 0
20-2*b = 0 // - 20
-2*b = -20 // : -2
b = -20/(-2)
b = 10
b = 10
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