Question:
Solve 10*l + 50 = -0*l for l..

Answer:
-5

Question:
Solve 24*v - 23*v - 39 = -22 for v..

Answer:
17

Question:
Solve 7 = 9*n + 16 for n..

Answer:
-1

Question:
Solve 80*a + 169 - 729 = 0 for a..

Answer:
7