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b in (-oo:+oo)
(3/5)*((2/3)*b+4)+b = 15 // - 15
(3/5)*((2/3)*b+4)+b-15 = 0
3/5*(2/3*b+4)+b-15 = 0
3/5*(2/3*b+4)+b-15 = 0
7/5*b-15+12/5 = 0
7/5*b-63/5 = 0
7/5*b-63/5 = 0
7/5*b-63/5 = 0 // + 63/5
7/5*b = 63/5 // : 7/5
b = 63/5/7/5
b = 9
b = 9
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