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x in (-oo:+oo)
x/(-4) = 9-5 // - 9-5
x/(-4)-9+5 = 0
-1/4*x-4 = 0 // + 4
-1/4*x = 4 // : -1/4
x = 4/(-1/4)
x = -16
x = -16
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