SOLUTION: I need more detail solution and explanation: If 3x+y-2z=7 and x-y-2z=5, find the value of 4x+2y-2z

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Question 824394: I need more detail solution and explanation:
If 3x+y-2z=7 and x-y-2z=5, find the value of 4x+2y-2z
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
3x+y-2z=7 ,
x-y-2z=5,
a=4x+2y-2z
a = 8, y = 1-x, z = x-3