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x in (-oo:+oo)
(2*x)/(-4) = 16 // - 16
(2*x)/(-4)-16 = 0
-1/2*x-16 = 0 // + 16
-1/2*x = 16 // : -1/2
x = 16/(-1/2)
x = -32
x = -32
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