Question:
Solve -6*d - 12 = -4*d for d..

Answer:
-6

Question:
Solve 0 = -66*u + 68*u - 6 for u..

Answer:
3

Question:
Solve 837*v = -158*v + 176*v + 6552 for v..

Answer:
8

Question:
Solve -2 = -2*k - 8 for k..

Answer:
-3