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(7*x-2)/5 = 8 // - 8
(7*x-2)/5-8 = 0
(7*x-2)/5+(-8*5)/5 = 0
7*x-8*5-2 = 0
7*x-42 = 0
(7*x-42)/5 = 0
(7*x-42)/5 = 0 // * 5
7*x-42 = 0
7*x-42 = 0 // + 42
7*x = 42 // : 7
x = 42/7
x = 6
x = 6
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