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7*x-(3/9) = 8 // - 8
7*x-(3/9)-8 = 0
7*x-1/3-8 = 0
7*x-25/3 = 0 // + 25/3
7*x = 25/3 // : 7
x = 25/3/7
x = 25/21
x = 25/21
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