Question:
Solve -103 + 78 = 5*k for k..

Answer:
-5

Question:
Solve 41559*d + 744 = 41590*d for d..

Answer:
24

Question:
Solve 12*w - 433426 = 38*w - 435532 for w..

Answer:
81

Question:
Solve -4*r + 40 = 4*r for r..

Answer:
5