Hey, Im not quite too sure about this problem what the value of [7]^(-1) is. I would believe [3] just because of addition and multiplication tables. But how do you determine what operation to use for the inverse? Thats where I get lost.

"Find all values of [x] in the set Z_m, 0<=x<m, that satisfy the equation."

[7]^(-1) - [2] = [x] in the set Z_10

x=1..? Help appreciated!