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b in (-oo:+oo)
18 = 5*b-(2*b)+6 // - 5*b-(2*b)+6
2*b-(5*b)-6+18 = 0
2*b-5*b-6+18 = 0
12-3*b = 0 // - 12
-3*b = -12 // : -3
b = -12/(-3)
b = 4
b = 4
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