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