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b in (-oo:+oo)
(-5/3)*(2*b+3/2) = 13/6-2*b // - 13/6-2*b
(-5/3)*(2*b+3/2)-(-2*b)-(13/6) = 0
(-5/3)*(2*b+3/2)+2*b-13/6 = 0
2*b-5/3*(2*b+3/2)-13/6 = 0
(-5/3*6*(2*b+3/2))/6+(2*6*b)/6-13/6 = 0
2*6*b-5/3*6*(2*b+3/2)-13 = 0
-8*b-15-13 = 0
-8*b-28 = 0
(-8*b-28)/6 = 0
(-8*b-28)/6 = 0 // * 6
-8*b-28 = 0
-8*b-28 = 0 // + 28
-8*b = 28 // : -8
b = 28/(-8)
b = -7/2
b = -7/2
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