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y in (-oo:+oo)
-1 = y/(-4)-6 // - y/(-4)-6
6-(y/(-4))-1 = 0
1/4*y+5 = 0 // - 5
1/4*y = -5 // : 1/4
y = -5/1/4
y = -20
y = -20
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