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y in (-oo:+oo)
(3/2)*y-y = (1/2)*y+4 // - (1/2)*y+4
(3/2)*y-y-((1/2)*y)-4 = 0
(3/2)*y-y+(-1/2)*y-4 = 0
-4 = 0
y belongs to the empty set
y belongs to the empty set
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