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Hello there 🙂
Once again the difficulty is to convert word into an equation.

Let’s say that 
‘a’ is the # of apples and ‘p’ the # of plums
We have according to the wording:
a+p=5343 (1) 

And we have:

a=p+123 (there are 123 more apples than plums) (2) 

By replacing ‘a’ in  (1) we have:
p+123+p=5343 so we have : 2p=5343-123=5220

So p= 2610

Then we replace ‘p’ in (2):

a=2610+123= 2733
Let’s verify our results

2610+2733=5343
There are 1615 plums and 1738 apples!

Hope you understand the logic and will be able to do it afterward! 
Thanks

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5343+123= 5466

5466/2= 2733

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There are 123 more apples than plums
Plums : apples
1 unit : 1 unit + 123

There are 5,343 plums and apples
1 unit + 1 unit + 123 = 5,343
2 units + 123 = 5,343
2 units = 5,343 – 123
2 units = 5,220
1 unit = 2,610

2,610 + 123 = 2,733 apples

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