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x in (-oo:+oo)
-1 = x/(-4)-6 // - x/(-4)-6
6-(x/(-4))-1 = 0
1/4*x+5 = 0 // - 5
1/4*x = -5 // : 1/4
x = -5/1/4
x = -20
x = -20
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