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(4*x-7)/5 = (6*x-5)/13 // - (6*x-5)/13
(4*x-7)/5-((6*x-5)/13) = 0
(4*x-7)/5+(-1*(6*x-5))/13 = 0
(13*(4*x-7))/(5*13)+(-1*5*(6*x-5))/(5*13) = 0
13*(4*x-7)-1*5*(6*x-5) = 0
22*x-66 = 0
(22*x-66)/(5*13) = 0
(22*x-66)/(5*13) = 0 // * 5*13
22*x-66 = 0
22*x-66 = 0 // + 66
22*x = 66 // : 22
x = 66/22
x = 3
x = 3
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