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b in (-oo:+oo)
(3/4)*b-(4/9) = 13/72 // - 13/72
(3/4)*b-(4/9)-(13/72) = 0
(3/4)*b-4/9-13/72 = 0
3/4*b-5/8 = 0 // + 5/8
3/4*b = 5/8 // : 3/4
b = 5/8/3/4
b = 5/6
b = 5/6
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