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x in (-oo:+oo)
6/12 = x/28 // - x/28
6/12-(x/28) = 0
1/2-1/28*x = 0 // - 1/2
-1/28*x = -1/2 // : -1/28
x = -1/2/(-1/28)
x = 14
x = 14
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