Question:
Solve 16*r - 2015 = 79*r + 3529 for r..

Answer:
-88

Question:
Solve -78*n + 5178 - 2784 = -102 for n..

Answer:
32

Question:
Solve -7*b + 75*b + 612 = 0 for b..

Answer:
-9

Question:
Solve 20*j - 8904 = -192*j for j..

Answer:
42