question: Teacher asked me this: Solve 4 = 2*s + 8 for s.
++++++++++
answer: -2

question: Teacher asked me this: Solve 23*n = 18*n - 20 for n.
++++++++++
answer: -4

question: Teacher asked me this: Solve -9*t + 4 = -5 for t.
++++++++++
answer: 1

question: Teacher asked me this: Solve 407 = 666*w + 651*w - 1284*w - 715 for w.
++++++++++
answer:
34