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