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