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b in (-oo:+oo)
3-(2*b) = 2*b-17 // - 2*b-17
3-(2*b)-(2*b)+17 = 0
3-2*b-2*b+17 = 0
20-4*b = 0 // - 20
-4*b = -20 // : -4
b = -20/(-4)
b = 5
b = 5
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