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(3*x-4)/5-7 = 0
(3*x-4)/5+(-7*5)/5 = 0
3*x-7*5-4 = 0
3*x-39 = 0
(3*x-39)/5 = 0
(3*x-39)/5 = 0 // * 5
3*x-39 = 0
3*x-39 = 0 // + 39
3*x = 39 // : 3
x = 39/3
x = 13
x = 13
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