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b in (-oo:+oo)
(2/3)*b-7 = b-(2*(b+3)) // - b-(2*(b+3))
2*(b+3)+(2/3)*b-b-7 = 0
2*(b+3)+(2*b)/3-b-7 = 0
(2*3*(b+3))/3+(2*b)/3+(3*(-b))/3+(-7*3)/3 = 0
2*3*(b+3)+2*b+3*(-b)-7*3 = 0
8*b-3*b-21+18 = 0
5*b-21+18 = 0
5*b-3 = 0
(5*b-3)/3 = 0
(5*b-3)/3 = 0 // * 3
5*b-3 = 0
5*b-3 = 0 // + 3
5*b = 3 // : 5
b = 3/5
b = 3/5
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