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(x-5)/4-((3-(4*x))/9) = 13 // - 13
(x-5)/4-((3-(4*x))/9)-13 = 0
(x-5)/4-((3-4*x)/9)-13 = 0
(x-5)/4+(-1*(3-4*x))/9-13 = 0
(9*(x-5))/(4*9)+(-1*4*(3-4*x))/(4*9)+(-13*4*9)/(4*9) = 0
9*(x-5)-1*4*(3-4*x)-13*4*9 = 0
25*x-468-57 = 0
25*x-525 = 0
(25*x-525)/(4*9) = 0
(25*x-525)/(4*9) = 0 // * 4*9
25*x-525 = 0
25*x-525 = 0 // + 525
25*x = 525 // : 25
x = 525/25
x = 21
x = 21
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