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b in (-oo:+oo)
(-1/2)*b-(1/2) = 6*b-7 // - 6*b-7
(-1/2)*b-(6*b)-(1/2)+7 = 0
(-1/2)*b-6*b-1/2+7 = 0
13/2-13/2*b = 0 // - 13/2
-13/2*b = -13/2 // : -13/2
b = -13/2/(-13/2)
b = 1
b = 1
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