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y in (-oo:+oo)
(1/2)*y-((1/3)*(y-1)) = 4*y // - 4*y
(1/2)*y-((1/3)*(y-1))-(4*y) = 0
(-1/3)*(y-1)+(1/2)*y-4*y = 0
y/2-1/3*(y-1)-4*y = 0
(-1/3*2*(y-1))/2+y/2+(-4*2*y)/2 = 0
y-1/3*2*(y-1)-4*2*y = 0
1/3*y-8*y+2/3 = 0
2/3-23/3*y = 0
(2/3-23/3*y)/2 = 0
(2/3-23/3*y)/2 = 0 // * 2
2/3-23/3*y = 0
2/3-23/3*y = 0 // - 2/3
-23/3*y = -2/3 // : -23/3
y = -2/3/(-23/3)
y = 2/23
y = 2/23
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