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