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x in (-oo:+oo)
(-1/3)*(18*x-(3*y)) = 0
(-1/3)*(18*x-3*y) = 0
-1/3*(18*x-3*y) = 0
18*x-3*y = 0 // + -3*y
18*x = -(-3*y) // : 18
x = (-(-3*y))/18
x = y/6
x = y/6
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