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x in (-oo:+oo)
-((1/2)*x)-8 = -5 // + 5
5-((1/2)*x)-8 = 0
(-1/2)*x-8+5 = 0
-1/2*x-3 = 0 // + 3
-1/2*x = 3 // : -1/2
x = 3/(-1/2)
x = -6
x = -6
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