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(5*X)/0.6-x-(4/0.8) = 0
(5*X)/0.6-x-5 = 0
8.33333333*X-x-5 = 0 // - 8.33333333*X-5
-x = -(8.33333333*X-5) // * -1
x = 8.33333333*X-5
x = 8.33333333*X-5
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