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b in (-oo:+oo)
-9 = (6/7)*(b+2) // - (6/7)*(b+2)
-((6/7)*(b+2))-9 = 0
(-6/7)*(b+2)-9 = 0
-6/7*(b+2)-9 = 0
-6/7*(b+2)-9 = 0
-6/7*b-75/7 = 0
-6/7*b-75/7 = 0
-6/7*b-75/7 = 0 // + 75/7
-6/7*b = 75/7 // : -6/7
b = 75/7/(-6/7)
b = -25/2
b = -25/2
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