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3*x-(1/2) = 3/7-(4*x) // - 3/7-(4*x)
3*x+4*x-(1/2)-(3/7) = 0
3*x+4*x-1/2-3/7 = 0
7*x-13/14 = 0 // + 13/14
7*x = 13/14 // : 7
x = 13/14/7
x = 13/98
x = 13/98
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