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x in (-oo:+oo)
(3-(5*x))/4 = (x+5)/9 // - (x+5)/9
(3-(5*x))/4-((x+5)/9) = 0
(3-5*x)/4-((x+5)/9) = 0
(3-5*x)/4+(-1*(x+5))/9 = 0
(9*(3-5*x))/(4*9)+(-1*4*(x+5))/(4*9) = 0
9*(3-5*x)-1*4*(x+5) = 0
7-49*x = 0
(7-49*x)/(4*9) = 0
(7-49*x)/(4*9) = 0 // * 4*9
7-49*x = 0
7-49*x = 0 // - 7
-49*x = -7 // : -49
x = -7/(-49)
x = 1/7
x = 1/7
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