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x in (-oo:+oo)
-6 = (1/2)*x-4 // - (1/2)*x-4
4-((1/2)*x)-6 = 0
(-1/2)*x-6+4 = 0
-1/2*x-2 = 0 // + 2
-1/2*x = 2 // : -1/2
x = 2/(-1/2)
x = -4
x = -4
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