Solve -7*k = 7*k - 14 for k.
Solve this plz.

A: 1

Solve 0 = -1240*r + 1236*r + 16 for r.
Solve this plz.

A: 4

Solve 0 = -25335*v + 26211*v + 18396 for v.
Solve this plz.

A:
-21