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2/7+1/2 = x/5 // - x/5
2/7-(x/5)+1/2 = 0
11/14-1/5*x = 0 // - 11/14
-1/5*x = -11/14 // : -1/5
x = -11/14/(-1/5)
x = 55/14
x = 55/14
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