question: Teacher asked me this: Solve 0 = 13*i + 15 - 15 for i.
++++++++++
answer: 0

question: Teacher asked me this: Solve -244*d + 77519 = -28*d - 610*d - 763*d for d.
++++++++++
answer: -67

question: Teacher asked me this: Solve 30 = -29*l + 2*l + 17*l for l.
++++++++++
answer: -3

question: Teacher asked me this: Solve -42*q = -46*q for q.
++++++++++
answer:
0