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