Substitution

Substitution

I reworked this solution because I feel that substitution is more intuitive for the students.

RobertFraser (talk)‎00:48, 5 March 2018

Thanks for refining my solutions Robert! I will be more cautious next time.

Best, Ziming

ZIMINGYIN (talk)‎18:14, 5 March 2018
 
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