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3/8-x/7 = 29/56 // - 29/56
3/8-x/7-(29/56) = 0
3/8-x/7-29/56 = 0
-1/7*x-1/7 = 0 // + 1/7
-1/7*x = 1/7 // : -1/7
x = 1/7/(-1/7)
x = -1
x = -1
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