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x in (-oo:+oo)
12/38 = x/19 // - x/19
12/38-(x/19) = 0
6/19-1/19*x = 0 // - 6/19
-1/19*x = -6/19 // : -1/19
x = -6/19/(-1/19)
x = 6
x = 6
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