i dont know how to do this please explain Thanks

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i dont know how to do this please explain Thanks

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i dont know how to do this please explain thanks

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x-4y-3z=21 2x-5y+12z=9 x-3y+3z=10

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i dont know how to do this please explain Thanks

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3y+x+5=3 I don't know how to do this, and I was wondering if you could help me step by step.

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Systems?

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Explain how and after how many steps you recognize a system of linear equation has infinitely many solutions. Solvimg systems of equations by elimination

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idk