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(2/5)*x+(1/15)*x+(1/20)*x = 62 // - 62
(2/5)*x+(1/15)*x+(1/20)*x-62 = 0
31/60*x-62 = 0 // + 62
31/60*x = 62 // : 31/60
x = 62/31/60
x = 120
x = 120
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