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y in (-oo:+oo)
(1/4)*(10-(2*y)) = 8 // - 8
(1/4)*(10-(2*y))-8 = 0
(1/4)*(10-2*y)-8 = 0
1/4*(10-2*y)-8 = 0
1/4*(10-2*y)-8 = 0
-1/2*y-11/2 = 0
-1/2*y-11/2 = 0
-1/2*y-11/2 = 0 // + 11/2
-1/2*y = 11/2 // : -1/2
y = 11/2/(-1/2)
y = -11
y = -11
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