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8*x+3*x+(8*x)/13 = 2500 // - 2500
8*x+3*x+(8*x)/13-2500 = 0
151/13*x-2500 = 0 // + 2500
151/13*x = 2500 // : 151/13
x = 2500/151/13
x = 32500/151
x = 32500/151
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