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x in (-oo:+oo)
2/12 = x/78 // - x/78
2/12-(x/78) = 0
1/6-1/78*x = 0 // - 1/6
-1/78*x = -1/6 // : -1/78
x = -1/6/(-1/78)
x = 13
x = 13
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