Question:
Solve 255*m = 13*m - 484 for m..

Answer:
-2

Question:
Solve 6842 + 195 = 2813*k - 1402 for k..

Answer:
3

Question:
Solve -84*s + 28 = -98*s for s..

Answer:
-2

Question:
Solve -14*r = -12*r + 4 for r..

Answer:
-2