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b in (-oo:+oo)
(-3/4)*b+8 = 6*b-49/4 // - 6*b-49/4
(-3/4)*b-(6*b)-(-49/4)+8 = 0
(-3/4)*b-6*b+49/4+8 = 0
81/4-27/4*b = 0 // - 81/4
-27/4*b = -81/4 // : -27/4
b = -81/4/(-27/4)
b = 3
b = 3
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