If it is that you make what is extracted 'm' and what is in the water layer as '(original amount - m)" ensure to keep track of what variable you name as the extraction vs what remained in the aqueous layer.
The general principle however, is after extraction, a certain mass of solute is left behind in the aqueous layer and we call that 'm' thus what is extracted from the aqueous layer must be "the total mass of solute - what was left behind in the aqueous layer".
Regardless of of how you use the variables as long as you keep track of the number and don't confuse them, you should be provided with same results.
Solvent Extraction is a phase separation technique use to separate solutes dissolved in two immiscible solvents.
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