Question:
Solve -45 = -11*k + 2*k for k..

Answer:
5

Question:
Solve 17*l + 222 = 29*l + 210 for l..

Answer:
1

Question:
Solve -10 = -4*r + 10 for r..

Answer:
5

Question:
Solve 0 = 114*o - 170*o + 840 for o..

Answer:
15