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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
-3*y-4 = 0 // + 4
-3*y = 4 // : -3
y = 4/(-3)
y = -4/3
y = -4/3
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