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x in (-oo:+oo)
-((1/2)*x)-6 = 8 // - 8
-((1/2)*x)-8-6 = 0
(-1/2)*x-8-6 = 0
-1/2*x-14 = 0 // + 14
-1/2*x = 14 // : -1/2
x = 14/(-1/2)
x = -28
x = -28
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