Question:
Solve -13*k = 9*k - 22 for k..

Answer:
1

Question:
Solve 344523 - 343711 = 28*j for j..

Answer:
29

Question:
Solve 89*l + 1200 = 89*l + 25*l for l..

Answer:
48

Question:
Solve -2*r + 46 = -66 + 42 for r..

Answer:
35