Solve -5*k + 7710 = 196*k - 21*k + 510 for k.
Solve this plz.

A: 40

Solve 42*d - 509 + 1652 = -2049 for d.
Solve this plz.

A: -76

Solve -26 = -5*r - 16 for r.
Solve this plz.

A:
2