Question:
Solve -4*c - 13*c + 16*c - 9 = 0 for c..

Answer:
-9

Question:
Solve 9*d = -28*d + 18*d + 152 for d..

Answer:
8

Question:
Solve -171*j = 2476 + 937 - 506 for j..

Answer:
-17

Question:
Solve 84*g - 26*g = 682 - 102 for g..

Answer:
10