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  3. 3xy5z12 3z6 2x3yz3 solve by substitution step by step please...

Question: 3xy5z12 3z6 2x3yz3 solve by substitution step by step please...

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3x+y+5z=12, 3z=6, 2x-3y-z=3 solve by substitution step by step please I really need to understand this.

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