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9/14 = (x/2)/42 // - (x/2)/42
9/14-((x/2)/42) = 0
(-1/84)*x+9/14 = 0
9/14-1/84*x = 0 // - 9/14
-1/84*x = -9/14 // : -1/84
x = -9/14/(-1/84)
x = 54
x = 54
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