194912

I found out the values of the variables by for the first one thinking what multiplied by 3 ends in a one and 3x7=21 so e must equal 7. I then carried the one over to the five and repeated that process for the problems.

My answer was
a=4, b=2, c=8, d=5, e=7, f=8, g=5, h=7, i=1, j=4