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If 2x+3y=31 ,\ \ y-z=4 and x+2z=11 , the...

If `2x+3y=31 ,\ \ y-z=4` and `x+2z=11` , then what is the value of `x+y+z` ? (a) 12 (b) 13 (c) 15 (d) 16

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