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