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11-11-2020
Mathematics

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Solve the system of equations: x + y + z = 5; x - y + 3z = 9; and z = 6.
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12-11-2020

x + y + 6 = 5
x - y + 18 = 9

2x + 24 = 14 minus 24
2x = -10 divided by 2
x = -5

-5 + y + 6 = 5
y = 4

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