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