Question:
Solve -6*x = -8*x + 4 for x..

Answer:
2

Question:
Solve 234*u + 1170 = 312*u for u..

Answer:
15

Question:
Solve -5*k + 49 = 64 for k..

Answer:
-3

Question:
Solve -1299*j - 747 = 28906 - 4972 for j..

Answer:
-19