(Back To School)
If B = 7, T = 11 and S = 9
Then:
B + T = 18
5T  S = 46
BTS = 693
S + S + S = 10T  83
Have you included a variety of equations?
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Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=August18
Here is the URL which will take them to a self marking exercise on substitution.