Question:
Solve -405*j = -423*j + 108 for j..

Answer:
6

Question:
Solve 12*z + 4 = -20 for z..

Answer:
-2

Question:
Solve 4 = -0*s - 2*s for s..

Answer:
-2

Question:
Solve -p - 6*p = -7 for p..

Answer:
1