Question:
Solve 38 = 14*r + 10 for r..

Answer:
2

Question:
Solve -41*h - 112 = -25*h for h..

Answer:
-7

Question:
Solve -23*l = 1840 - 1357 for l..

Answer:
-21

Question:
Solve 0 = 14*f - 12*f for f..

Answer:
0