Question:
Solve -11 = 38*r - 21 - 66 for r..

Answer:
2

Question:
Solve 11*a - 3972 = 36*a - 0*a - 1672 for a..

Answer:
-92

Question:
Solve -15*b - 80 = -5 for b..

Answer:
-5

Question:
Solve 3865*j = 3860*j + 140 for j..

Answer:
28