(E) : 2Lcm(x,y)-5gcf(x,y0=7
1- Find the possible values of the the number T=gcf(x,y)
2- Solve in N^2 the equation (E).
The Attempt at a Solution
For number 1 i transformed the equation and I found an equivalence of 2T Ξ 7(mod 5gcf(x,y) is that correct, and how can i proceed.