Question:
Solve 0 = 50*c - 14*c - 180 for c..

Answer:
5

Question:
Solve -75*b - 15280 = 1776*b + 17374 - 4889 for b..

Answer:
-15

Question:
Solve -1209*v + 155641 = -7463*v + 671 - 314080 for v..

Answer:
-75

Question:
Solve -310*d - 260*d - 226*d + 618*d - 890 = 0 for d..

Answer:
-5