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