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