Write down the solution for this math problem: Solve 28*w = 21*w + 7 for w.
answer: 1

Write down the solution for this math problem: Solve -176 = 4163476*t - 4163492*t for t.
answer: 11

Write down the solution for this math problem: Solve 0 = -33*r - 319 + 253 for r.
answer: -2

Write down the solution for this math problem: Solve 4*i = 2 - 14 for i.
answer:
-3