Question:
Solve y + 49 = 30 + 21 for y..

Answer:
2

Question:
Solve 864 = 34196*z - 34178*z for z..

Answer:
48

Question:
Solve 70 = 11*n + 18 + 140 for n..

Answer:
-8

Question:
Solve -38*l + 16592 = 17694 for l..

Answer:
-29