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