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y in (-oo:+oo)
1/2-(2*y) = -6 // + 6
1/2-(2*y)+6 = 0
1/2-2*y+6 = 0
13/2-2*y = 0 // - 13/2
-2*y = -13/2 // : -2
y = -13/2/(-2)
y = 13/4
y = 13/4
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