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3*x-2 = 13/4 // - 13/4
3*x-(13/4)-2 = 0
3*x-13/4-2 = 0
3*x-21/4 = 0 // + 21/4
3*x = 21/4 // : 3
x = 21/4/3
x = 7/4
x = 7/4
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