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and Susan has one-fourth as many as Joe, who has 4, how many

does Mary have if Mary has two more than Tom?

If more or this type of exercise is useful to you

additonal ones can be added. Let me know by

COPY and PASTE can be used to effect substitution reliably.

Copy the top equation and paste it in the substitution box.

Then copy the right side of each indented equation, starting with the first one, and paste them on the appropriate symbols in the substitution box.

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