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X in (-oo:+oo)
1-((6-X)/4) = X // - X
1-((6-X)/4)-X = 0
(-1*(6-X))/4-X+1 = 0
(-1*(6-X))/4+(4*(-X))/4+(1*4)/4 = 0
4*(-X)-1*(6-X)+1*4 = 0
4-3*X-6 = 0
-3*X-2 = 0
(-3*X-2)/4 = 0
(-3*X-2)/4 = 0 // * 4
-3*X-2 = 0
-3*X-2 = 0 // + 2
-3*X = 2 // : -3
X = 2/(-3)
X = -2/3
X = -2/3
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