Question:
Solve 7*y - 13 = -6 for y..

Answer:
1

Question:
Solve -9*x - 30 = -21 for x..

Answer:
-1

Question:
Solve -6800 = 56054*w - 55918*w for w..

Answer:
-50

Question:
Solve 3400 = -0*y + 200*y for y..

Answer:
17