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y in (-oo:+oo)
y/4+3 = -y/8 // + -y/8
y/4-(-y/8)+3 = 0
y/4+(1/8)*y+3 = 0
3/8*y+3 = 0 // - 3
3/8*y = -3 // : 3/8
y = -3/3/8
y = -8
y = -8
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