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x in (-oo:+oo)
12*x-(x*((8*y)/4))-(2*y) = 0
12*x-2*x*y-2*y = 0
-2*x*y-2*y = 0 // + -2*y
-2*x*y = -(-2*y) // : -2*y
x = (-(-2*y))/(-2*y)
x = -1
x = -1
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