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