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3*x-7 = 5/4 // - 5/4
3*x-(5/4)-7 = 0
3*x-5/4-7 = 0
3*x-33/4 = 0 // + 33/4
3*x = 33/4 // : 3
x = 33/4/3
x = 11/4
x = 11/4
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