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y in (-oo:+oo)
3*(1/2)-(2*y) = 27 // - 27
3*(1/2)-(2*y)-27 = 0
3*(1/2)-2*y-27 = 0
-2*y-51/2 = 0 // + 51/2
-2*y = 51/2 // : -2
y = 51/2/(-2)
y = -51/4
y = -51/4
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