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(3*x-4)/5 = 3 // - 3
(3*x-4)/5-3 = 0
(3*x-4)/5+(-3*5)/5 = 0
3*x-3*5-4 = 0
3*x-19 = 0
(3*x-19)/5 = 0
(3*x-19)/5 = 0 // * 5
3*x-19 = 0
3*x-19 = 0 // + 19
3*x = 19 // : 3
x = 19/3
x = 19/3
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