Question 381720
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Hi,         
x + y + 3z = 12  y = 2x and z = 3x
x + 2x + 3(3x) = 12
 12x = 12
   x = 1
You are absolutely correct:  x = 1, y = 2  and z = 3
CHECKING the Answer
 1 + 2 + 3*3 = 12