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(2*x)/7+(5*x)/4 = 10 // - 10
(2*x)/7+(5*x)/4-10 = 0
43/28*x-10 = 0 // + 10
43/28*x = 10 // : 43/28
x = 10/43/28
x = 280/43
x = 280/43
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