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b in (-oo:+oo)
(4/5)*b+2/3 = 6/5 // - 6/5
(4/5)*b+2/3-(6/5) = 0
(4/5)*b+2/3-6/5 = 0
4/5*b-8/15 = 0 // + 8/15
4/5*b = 8/15 // : 4/5
b = 8/15/4/5
b = 2/3
b = 2/3
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