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b in (-oo:+oo)
-6 = 4*b-2*b+4 // - 4*b-2*b+4
-(-2*b)-(4*b)-6-4 = 0
2*b-4*b-6-4 = 0
-2*b-10 = 0 // + 10
-2*b = 10 // : -2
b = 10/(-2)
b = -5
b = -5
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