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b in (-oo:+oo)
(3/4)*(2*b-5)-((5/4)*(3*b+9)) = -6 // + 6
(3/4)*(2*b-5)-((5/4)*(3*b+9))+6 = 0
(3/4)*(2*b-5)+(-5/4)*(3*b+9)+6 = 0
3/4*(2*b-5)-5/4*(3*b+9)+6 = 0
3/4*(2*b-5)-5/4*(3*b+9)+6 = 0
6-9/4*b-15 = 0
-9/4*b-9 = 0
-9/4*b-9 = 0
-9/4*b-9 = 0 // + 9
-9/4*b = 9 // : -9/4
b = 9/(-9/4)
b = -4
b = -4
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