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y in (-oo:+oo)
12*(1/2) = 2*(1/2)*y // - 2*(1/2)*y
12*(1/2)-(2*(1/2)*y) = 0
12*(1/2)-y = 0
6-y = 0 // - 6
-y = -6 // * -1
y = 6
y = 6
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