Q: Solve -7*r = 2*r - 18 for r.

A: 2

Q: Solve -1515*t - 7805 = -36590 for t.

A: 19

Q: Solve 20*w - 23*w + 6 = 0 for w.

A: 2

Q: Solve 693*q + 2958 = 200*q for q.

A:
-6