Sharp EL-9900 - Manual (Page 211)

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Chapter 12: The SOLVER Feature
3. Recalling a Previously Saved Equation
To recall a stored SOLVER equation:
1. Go to the SOLVER menu,
and press B to select
the B EQTN sub-menu.
2. A list of saved equation
names appears in the sub-
menu. Select the equation you wish to call back.
3. Press E. The stored equation is called back.
Note: Any changes unsaved prior to recalling will be lost. Also be aware
that any changes to the recalled equation will not be retained
unless saved manually.