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x in (-oo:+oo)
-6 = x/4-1 // - x/4-1
1-(x/4)-6 = 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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