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