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