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x in (-oo:+oo)
(3/4)*(x-9) = (4/5)*(5*x-7) // - (4/5)*(5*x-7)
(3/4)*(x-9)-((4/5)*(5*x-7)) = 0
(3/4)*(x-9)+(-4/5)*(5*x-7) = 0
3/4*(x-9)-4/5*(5*x-7) = 0
3/4*(x-9)-4/5*(5*x-7) = 0
-13/4*x-23/20 = 0
-13/4*x-23/20 = 0
-13/4*x-23/20 = 0 // + 23/20
-13/4*x = 23/20 // : -13/4
x = 23/20/(-13/4)
x = -23/65
x = -23/65
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