Question 1132020
3A+2C=31
2A+3C=29
xA+6C=58 from the second row this would be 4A, doubling everything  ANSWER

-6A-4C=-62
6A+9C=87
5C=25
C=$5
3A=21 
A=$7
check the xA+6C and when A=$4 and C=$5, it is $58