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b in (-oo:+oo)
(4*b+5)/7-((2*b-4)/5) = 1 // - 1
(4*b+5)/7-((2*b-4)/5)-1 = 0
(4*b+5)/7+(-1*(2*b-4))/5-1 = 0
(5*(4*b+5))/(5*7)+(-1*7*(2*b-4))/(5*7)+(-1*5*7)/(5*7) = 0
5*(4*b+5)-1*7*(2*b-4)-1*5*7 = 0
6*b-35+53 = 0
6*b+18 = 0
(6*b+18)/(5*7) = 0
(6*b+18)/(5*7) = 0 // * 5*7
6*b+18 = 0
6*b+18 = 0 // - 18
6*b = -18 // : 6
b = -18/6
b = -3
b = -3
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