The given matrix equation is,
3[ x y z w ]=[ x 6 −1 2w ]+[ 4 x+y z+w 3 ]
Simplify the above matrix equation,
[ 3x 3y 3z 3w ]=[ x+4 6+x+y −1+z+w 2w+3 ]
Compare both side of above equation,
3x=x+4 2x=4 x=2
And,
3y=6+x+y
Substitute the value of x in the above equation,
3y=6+2+y 2y=8 y=4
Similarly,
3w=2w+3 w=3
And,
3z=−1+z+w 3z−z=−1+3 2z=2 z=1
Therefore, the value of x is 2, the value of y is 4, the value of z is 1 and the value of w is 3.