Question:
Solve 4*r - 5 = 5*r for r..

Answer:
-5

Question:
Solve 160 = 57*t - 25*t for t..

Answer:
5

Question:
Solve 3179*m - 327*m + 142600 = 0 for m..

Answer:
-50

Question:
Solve -27931*w + 80 = -27891*w for w..

Answer:
2