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b in (-oo:+oo)
4*b-(6*b)+6 = 28 // - 28
4*b-(6*b)-28+6 = 0
4*b-6*b-28+6 = 0
-2*b-22 = 0 // + 22
-2*b = 22 // : -2
b = 22/(-2)
b = -11
b = -11
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