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y in (-oo:+oo)
1/4-7 = (1/8)*y // - (1/8)*y
1/4-((1/8)*y)-7 = 0
(-1/8)*y+1/4-7 = 0
-1/8*y-27/4 = 0 // + 27/4
-1/8*y = 27/4 // : -1/8
y = 27/4/(-1/8)
y = -54
y = -54
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