(Back To School)
If B = 4, T = 5 and S = 6
Then:
B + T = 9
5T  S = 19
BTS = 120
S + S + S = 10T  32
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.