Q: Solve -26*n - 69 = 35 for n.

A: -4

Q: Solve 5902 = -2719*p + 2870*p - 4215 for p.

A: 67

Q: Solve 0 = -14*u + 15*u - 21*u for u.

A: 0

Q: Solve 0 = 1221*r - 1174*r + 235 for r.

A:
-5