Question:
Solve 10*x - 8 = -38 for x..

Answer:
-3

Question:
Solve 120 = -11*r + 32 for r..

Answer:
-8

Question:
Solve -2*a - 2 = -8 for a..

Answer:
3

Question:
Solve 260*l - 217*l + 946 = 0 for l..

Answer:
-22