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(4*x)/5-((5*x)/13) = 7/1-(8/5) // - 7/1-(8/5)
(4*x)/5-((5*x)/13)-(7/1)+8/5 = 0
(4*x)/5+(-5/13)*x+8/5-7 = 0
27/65*x-27/5 = 0 // + 27/5
27/65*x = 27/5 // : 27/65
x = 27/5/27/65
x = 13
x = 13
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