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(7*x)/9+5/3 = 4 // - 4
(7*x)/9+5/3-4 = 0
7/9*x-7/3 = 0 // + 7/3
7/9*x = 7/3 // : 7/9
x = 7/3/7/9
x = 3
x = 3
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