Define cell value in a matrix to add up 2 constraints value
 

I have a matrix to match same SUM value (550) from left-right and up-down
X Y Z Total
A 100 90 80 270
B 70 0 60 130
C 0 50 40 150
TARGET 200 150 200 550

VARIANCE 30 10 20

Seems like I still have discrepancy with up-down summary. I must change
matrix (AX : CZ cells) value so that don't affect my left-right summary. How
to use solver for this?