Question:
Solve 1259 = -104*r + 7*r - 681 for r..

Answer:
-20

Question:
Solve 927 = -101*d - 83 for d..

Answer:
-10

Question:
Solve 36 - 11 = -5*z for z..

Answer:
-5

Question:
Solve 668 = -7*z + 675 for z..

Answer:
1