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(7-(9*x))/4 = (5-(4*x))/9 // - (5-(4*x))/9
(7-(9*x))/4-((5-(4*x))/9) = 0
(7-9*x)/4-((5-4*x)/9) = 0
(7-9*x)/4+(-1*(5-4*x))/9 = 0
(9*(7-9*x))/(4*9)+(-1*4*(5-4*x))/(4*9) = 0
9*(7-9*x)-1*4*(5-4*x) = 0
43-65*x = 0
(43-65*x)/(4*9) = 0
(43-65*x)/(4*9) = 0 // * 4*9
43-65*x = 0
43-65*x = 0 // - 43
-65*x = -43 // : -65
x = -43/(-65)
x = 43/65
x = 43/65
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