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x in (-oo:+oo)
8-((1/2)*x) = (1/6)*x // - (1/6)*x
8-((1/2)*x)-((1/6)*x) = 0
(-1/2)*x+(-1/6)*x+8 = 0
8-2/3*x = 0 // - 8
-2/3*x = -8 // : -2/3
x = -8/(-2/3)
x = 12
x = 12
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