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5-((2*x)/7) = 13-((2*x)/5) // - 13-((2*x)/5)
(2*x)/5-((2*x)/7)-13+5 = 0
(-2/7)*x+(2*x)/5-13+5 = 0
4/35*x-8 = 0 // + 8
4/35*x = 8 // : 4/35
x = 8/4/35
x = 70
x = 70
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