i V7 i  at the keyboard i V7 i for pianists Keyboard Harmony   William Wieland
Explanation
Simple position triads (snowmen)
Share between the hands.
Double the root of each chord.
Note that in minor keys an accidental is required to create a leading tone for the dominant seventh chord. Here it is E natural.

3 keys(Learn all 12 keys if possible.)
To play the dominant seventh chord in the right hand, use all but your middle finger. The left hand simply plays pinky - thumb - pinky.