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14+2z=2(x-3y) 4(x-3y-z)=28 3(2x+y)+4z=-22 solve the systems of equations.

basically you have to solve the systems to figure the variables and they are in a weird format that i dont know of.
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Simplify each equation and get the variables on one side so each equation is of the form Ax + By + Cz = D.
The solve using elimination or matrices.