Question:
Solve -350*y = -38386 + 117270 - 47384 for y..

Answer:
-90

Question:
Solve 312*u = 192*u + 360 for u..

Answer:
3

Question:
Solve -19*z = 36*z + 1350 - 1570 for z..

Answer:
4

Question:
Solve -42672*r = -42736*r - 576 for r..

Answer:
-9