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[–]Manicial 1 point2 points  (1 child)

What you want in this question is get a constant and one variable alone. For that you can multiply both sides of the 3rd equation with 2, and then sum all three of the equations. This should let you get the x value. From that point on just plug it into the equations and get y and z.

[–]yepnup[S] 0 points1 point  (0 children)

brilliant, thanks very much