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x in (-oo:+oo)
(4*x)/(-1) = 64 // - 64
(4*x)/(-1)-64 = 0
-4*x-64 = 0
-4*x-64 = 0 // + 64
-4*x = 64 // : -4
x = 64/(-4)
x = -16
x = -16
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