Question:
Solve 27*s = 18*s - 27 for s..

Answer:
-3

Question:
Solve 3527*z = -2384*z + 1147*z - 181032 for z..

Answer:
-38

Question:
Solve 2190*n + 2187*n - 18 = 4376*n for n..

Answer:
18

Question:
Solve 227*m = 231*m + 12 for m..

Answer:
-3