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y in (-oo:+oo)
(1/4)*y+9 = (1/8)*y // - (1/8)*y
(1/4)*y-((1/8)*y)+9 = 0
(1/4)*y+(-1/8)*y+9 = 0
1/8*y+9 = 0 // - 9
1/8*y = -9 // : 1/8
y = -9/1/8
y = -72
y = -72
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