**72**

If Rectangle- x,

Star- y,

Triangle- z,

we have

3x+y=67 --------> (1)

x+2y+z=79 --------> (2)

2y+2z=84 --------> (3)

2x+y+z=?

(3) => y+z=42, considering this in (2) --> x+y+42=79 => x+y=37, considering this in (1) --> 2x+37=67 => x=15

Then we find that y=22 and z=20

2x+y+z=**72**