Question:
Solve -69*x - 2 - 7 = -78*x for x..

Answer:
1

Question:
Solve -23*d = -121*d + 127 - 727 - 4202 for d..

Answer:
-49

Question:
Solve 88*x = 91*x + 15 for x..

Answer:
-5

Question:
Solve -10*j - 58 = -38 for j..

Answer:
-2