Question:
Solve 420*x + 8742*x + 13043*x = -1110250 for x..

Answer:
-50

Question:
Solve -558*a + 2617*a - 46506 = -7385 for a..

Answer:
19

Question:
Solve -294*r = 367*r - 124*r + 3222 for r..

Answer:
-6

Question:
Solve -y - 3 = -2*y for y..

Answer:
3