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x in (-oo:+oo)
x/4 = x/2-1 // - x/2-1
x/4-(x/2)+1 = 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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