Question:
Solve 47*a = -13*a + 237*a + 20355 for a..

Answer:
-115

Question:
Solve -109*b - 144 = -101*b for b..

Answer:
-18

Question:
Solve 4576*z - 308 = 4598*z for z..

Answer:
-14

Question:
Solve 74*w + 57 + 207 = 50*w for w..

Answer:
-11