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(x-4)/5 = x/7 // - x/7
(x-4)/5-(x/7) = 0
(x-4)/5-x/7 = 0
(7*(x-4))/(5*7)+(5*(-x))/(5*7) = 0
7*(x-4)+5*(-x) = 0
2*x-28 = 0
(2*x-28)/(5*7) = 0
(2*x-28)/(5*7) = 0 // * 5*7
2*x-28 = 0
2*x-28 = 0 // + 28
2*x = 28 // : 2
x = 28/2
x = 14
x = 14
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