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(1/4)*x+(1/5)*x+(1/8)*x = 23 // - 23
(1/4)*x+(1/5)*x+(1/8)*x-23 = 0
23/40*x-23 = 0 // + 23
23/40*x = 23 // : 23/40
x = 23/23/40
x = 40
x = 40
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