Q: Solve:
Solve -71 + 694 = -38*x - 99 for x.

A: -19

Q: Solve:
Solve 0 = 238*t + 157*t - 117*t + 1946 for t.

A: -7

Q: Solve:
Solve 46*r + 1385 = 971 for r.

A:
-9