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    Need Help With Solving Equations with Three Variables

    An example of what I am doing would be this.. 2x-y+2z=15 -x+y+z=3 3x-y+2z=18 My teacher had said that there are no fractions in the answer but I can't figure it out at all, and I have 8 of these problems. I have to solve for (x,y,z) with again no fractions. Please HELP!
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