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b in (-oo:+oo)
(3/2)*(b-20) = (7/5)*(5*b-3) // - (7/5)*(5*b-3)
(3/2)*(b-20)-((7/5)*(5*b-3)) = 0
(3/2)*(b-20)+(-7/5)*(5*b-3) = 0
3/2*(b-20)-7/5*(5*b-3) = 0
3/2*(b-20)-7/5*(5*b-3) = 0
-11/2*b-129/5 = 0
-11/2*b-129/5 = 0
-11/2*b-129/5 = 0 // + 129/5
-11/2*b = 129/5 // : -11/2
b = 129/5/(-11/2)
b = -258/55
b = -258/55
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