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