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b in (-oo:+oo)
(1/2)*b+2/3 = 13/15 // - 13/15
(1/2)*b+2/3-(13/15) = 0
(1/2)*b+2/3-13/15 = 0
1/2*b-1/5 = 0 // + 1/5
1/2*b = 1/5 // : 1/2
b = 1/5/1/2
b = 2/5
b = 2/5
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