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y in (-oo:+oo)
2*y-y/2 = -1 // + 1
2*y-y/2+1 = 0
3/2*y+1 = 0 // - 1
3/2*y = -1 // : 3/2
y = -1/3/2
y = -2/3
y = -2/3
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