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WAIT that's the wrong equation!!
It's
5x-y+Z=4, x+2y-Z=5, 2x+3y+3Z=5

so which letter do you want to eliminate... y or z..?

Whichever is easier.

you'll need to check the calculations

So x=(61/49)?

that's x... very ugly

Huh. The answer is x=1, y=3, z=2...

so it looks like the last equation should be
2x + 3y - 3z = 5

Yes. Oops!! So sorry

oops should read -3z = 5

yes!! thank you so much!!