Question:
Solve 67*v + 1340 = -381 + 247 for v..

Answer:
-22

Question:
Solve -945*c = 4412 - 31817 for c..

Answer:
29

Question:
Solve -417 + 310 = 14*o + 147 + 264 for o..

Answer:
-37

Question:
Solve 760*a = 920*a + 2400 for a..

Answer:
-15