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