Solve 335*k - 8 = 692*k - 353*k for k.
Solve this plz.

A: -2

Solve -6914*a + 3595*a - 170374 = 54*a + 6649*a for a.
Solve this plz.

A: -17

Solve -9*r + 13*r - 20 = 0 for r.
Solve this plz.

A:
5