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That is 2x+z-3y=0, then 2x+z=3y 3x-(2y+6z)=0, then 3x=2y+6z.

3x=2y+6z times 2/3 on both sides of the equation can be simplified as 2x=4/3y+4z.

If 2x=4/3y+4z is brought into formula ①, it becomes 4/3y+4z+z = 3y; If you simplify the equation, you will get 3z = y；; If 3z=y is brought into formula ②, it becomes 3x = 2y+2y; If you simplify it, you will get 3x=4y and x=3/4y.

When x= 16, y= 12 and z=4, then x= 16.

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