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(5*x)/9-((3*x)/8) = 13 // - 13
(5*x)/9-((3*x)/8)-13 = 0
(5*x)/9+(-3/8)*x-13 = 0
13/72*x-13 = 0 // + 13
13/72*x = 13 // : 13/72
x = 13/13/72
x = 72
x = 72
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