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x in (-oo:+oo)
(x*y)/2 = 12 // - 12
(x*y)/2-12 = 0
1/2*x*y-12 = 0 // + 12
1/2*x*y = 12 // : 1/2*y
x = 12/(1/2*y)
x = 24*y^-1
x = 24*y^-1
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