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8*x-(x*((8*y)/16))-(16*y) = 0
8*x+(-1/2)*x*y-16*y = 0
-1/2*x*y-16*y = 0 // + -16*y
-1/2*x*y = -(-16*y) // : -1/2*y
x = (-(-16*y))/(-1/2*y)
x = -32
x = -32
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