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(3*x)/5+17/5 = x/5+21/3 // - x/5+21/3
(3*x)/5-(x/5)+17/5-(21/3) = 0
(3*x)/5-(x/5)+17/5-7 = 0
2/5*x-18/5 = 0 // + 18/5
2/5*x = 18/5 // : 2/5
x = 18/5/2/5
x = 9
x = 9
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