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(5*x)/6 = 21/9 // - 21/9
(5*x)/6-(21/9) = 0
(5*x)/6-7/3 = 0
5/6*x-7/3 = 0 // + 7/3
5/6*x = 7/3 // : 5/6
x = 7/3/5/6
x = 14/5
x = 14/5
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