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Solving Systems of Linear Equations With Three Variables

-2x +3y -4z =3 (three problems)
3x-5y + 2z = 4
-4x + 27 -3z+0

Solve each system below

x + y + z = 9
x + y = 5
z = 1

x-y+z= 2
y-z=3
x = 4

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