Question:
Solve -63*y + 504 = -135*y for y..

Answer:
-7

Question:
Solve -136*z - 310*z - 352*z = -109*z - 26182 for z..

Answer:
38

Question:
Solve -6*w = 7*w - 5*w for w..

Answer:
0

Question:
Solve -43*w + 28*w = 15 for w..

Answer:
-1