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x in (-oo:+oo)
7/14 = (12/2)*x // - (12/2)*x
7/14-((12/2)*x) = 0
7/14-6*x = 0
1/2-6*x = 0 // - 1/2
-6*x = -1/2 // : -6
x = -1/2/(-6)
x = 1/12
x = 1/12
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