Question:
Solve 0 = 2*g + 4 - 0 for g..

Answer:
-2

Question:
Solve 225 = -98*r - 725 - 324 for r..

Answer:
-13

Question:
Solve -6*k = -4*k - 2 for k..

Answer:
1

Question:
Solve -86*z + 212 + 169 = 2617 for z..

Answer:
-26