Question:
Solve 144 = -4*s - 7*s - 13*s for s..

Answer:
-6

Question:
Solve -524*r - 745*r + 291309 = 1273*r + 93033 for r..

Answer:
78

Question:
Solve 105*g = -73*g - 972 - 1164 for g..

Answer:
-12

Question:
Solve 390714*g - 390699*g = -150 for g..

Answer:
-10