Question:
Solve 6887*k - 3640 = 7342*k for k..

Answer:
-8

Question:
Solve 0 = -12*r + 34*r + 132 for r..

Answer:
-6

Question:
Solve 211*h + 5008 + 11310 = -187*h for h..

Answer:
-41

Question:
Solve 0 = 2*t - 15 + 13 for t..

Answer:
1