Question:
Solve 4*r = -2 + 2 for r..

Answer:
0

Question:
Solve -5 + 8 = -s for s..

Answer:
-3

Question:
Solve -19*x = -13*x for x..

Answer:
0

Question:
Solve 101*p = -72*p + 34*p - 556 for p..

Answer:
-4