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y in (-oo:+oo)
11/2-y = (1/2)*y+4 // - (1/2)*y+4
11/2-y-((1/2)*y)-4 = 0
(-1/2)*y-y+11/2-4 = 0
3/2-3/2*y = 0 // - 3/2
-3/2*y = -3/2 // : -3/2
y = -3/2/(-3/2)
y = 1
y = 1
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