Commercial bank balance sheet after Fed purchases $10 million in Treasury Bonds
The sale of the bonds (assets) will only affect the assets-side of the balance sheet.

If Acme bank did not lend out the money, your “bonds” would go 50-10 = 40. And your cash would go 0+10 = 10.

If they lend out the money, bonds still go to 40 and lending goes up by 10, so 50+10 = 60.