Question:
Solve 280 = -5*r + 275 for r..

Answer:
-1

Question:
Solve -25*u - 47 - 21 = 232 for u..

Answer:
-12

Question:
Solve -643*h + 26088 - 4869 = 0 for h..

Answer:
33

Question:
Solve -114 = 2*j - 104 for j..

Answer:
-5