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y in (-oo:+oo)
y+y+8 = 450/8 // - 450/8
y+y-(450/8)+8 = 0
y+y-225/4+8 = 0
2*y-193/4 = 0 // + 193/4
2*y = 193/4 // : 2
y = 193/4/2
y = 193/8
y = 193/8
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