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(7*x-3)/9 = 8 // - 8
(7*x-3)/9-8 = 0
(7*x-3)/9+(-8*9)/9 = 0
7*x-8*9-3 = 0
7*x-75 = 0
(7*x-75)/9 = 0
(7*x-75)/9 = 0 // * 9
7*x-75 = 0
7*x-75 = 0 // + 75
7*x = 75 // : 7
x = 75/7
x = 75/7
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