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y in (-oo:+oo)
3*y-((2*(y-1))/6) = -1 // + 1
3*y-((2*(y-1))/6)+1 = 0
(-1/3)*(y-1)+3*y+1 = 0
3*y-1/3*(y-1)+1 = 0
3*y-1/3*(y-1)+1 = 0
8/3*y+1/3+1 = 0
8/3*y+4/3 = 0
8/3*y+4/3 = 0
8/3*y+4/3 = 0 // - 4/3
8/3*y = -4/3 // : 8/3
y = -4/3/8/3
y = -1/2
y = -1/2
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