Question:
Solve 0*y + 15 = 5*y for y..

Answer:
3

Question:
Solve -j = -58 - 59 + 126 for j..

Answer:
-9

Question:
Solve 0 = -0*q + 7*q + 7 for q..

Answer:
-1

Question:
Solve 1540 = 883*r - 743*r for r..

Answer:
11