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(5*x-10)/10 = (3*x-5)/7 // - (3*x-5)/7
(5*x-10)/10-((3*x-5)/7) = 0
(5*x-10)/10+(-1*(3*x-5))/7 = 0
(7*(5*x-10))/(7*10)+(-1*10*(3*x-5))/(7*10) = 0
7*(5*x-10)-1*10*(3*x-5) = 0
5*x-20 = 0
(5*x-20)/(7*10) = 0
(5*x-20)/(7*10) = 0 // * 7*10
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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