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