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3*x = 13/2-4 // - 13/2-4
3*x-(13/2)+4 = 0
3*x-13/2+4 = 0
3*x-5/2 = 0 // + 5/2
3*x = 5/2 // : 3
x = 5/2/3
x = 5/6
x = 5/6
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