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x in (-oo:+oo)
-((1/2)*x)-3 = 1 // - 1
-((1/2)*x)-3-1 = 0
(-1/2)*x-3-1 = 0
-1/2*x-4 = 0 // + 4
-1/2*x = 4 // : -1/2
x = 4/(-1/2)
x = -8
x = -8
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