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y in (-oo:+oo)
1/2 = (1/4)*y-8 // - (1/4)*y-8
1/2-((1/4)*y)+8 = 0
(-1/4)*y+1/2+8 = 0
17/2-1/4*y = 0 // - 17/2
-1/4*y = -17/2 // : -1/4
y = -17/2/(-1/4)
y = 34
y = 34
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