Finding Equivalent Resistance
Observe that in the original circuit the resistors R6 and R7 are short as they have a wire connecting their ends. You can just replace them with a short. Replacing it with a short you are left with R4 and R5 in parallel. It should be fairly easy to solve from here. It is

$$ R3 || (R2 + (R4 || R5)) = 0.6 \Omega $$.