Question:
Solve -l + 20 = -5*l for l..

Answer:
-5

Question:
Solve 142040*a = 140906*a - 83916 for a..

Answer:
-74

Question:
Solve -38*y - 7707 + 6871 = 0 for y..

Answer:
-22

Question:
Solve 0 = -5*r + 21 + 4 for r..

Answer:
5