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3/7-(x/4) = 1/28 // - 1/28
3/7-(x/4)-(1/28) = 0
3/7-(x/4)-1/28 = 0
11/28-1/4*x = 0 // - 11/28
-1/4*x = -11/28 // : -1/4
x = -11/28/(-1/4)
x = 11/7
x = 11/7
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