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4*x-(2/7) = 306/7 // - 306/7
4*x-(2/7)-(306/7) = 0
4*x-2/7-306/7 = 0
4*x-44 = 0 // + 44
4*x = 44 // : 4
x = 44/4
x = 11
x = 11
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