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(4*x)/5 = (x-2)/7 // - (x-2)/7
(4*x)/5-((x-2)/7) = 0
(-1*(x-2))/7+(4*x)/5 = 0
(-1*5*(x-2))/(5*7)+(4*7*x)/(5*7) = 0
4*7*x-1*5*(x-2) = 0
23*x+10 = 0
(23*x+10)/(5*7) = 0
(23*x+10)/(5*7) = 0 // * 5*7
23*x+10 = 0
23*x+10 = 0 // - 10
23*x = -10 // : 23
x = -10/23
x = -10/23
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