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a in (-oo:+oo)
(4*a-1)/7 = (3*a-1)/5 // - (3*a-1)/5
(4*a-1)/7-((3*a-1)/5) = 0
(4*a-1)/7+(-1*(3*a-1))/5 = 0
(5*(4*a-1))/(5*7)+(-1*7*(3*a-1))/(5*7) = 0
5*(4*a-1)-1*7*(3*a-1) = 0
2-a = 0
(2-a)/(5*7) = 0
(2-a)/(5*7) = 0 // * 5*7
2-a = 0
2-a = 0 // - 2
-a = -2 // * -1
a = 2
a = 2
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