Question

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Answer 1

Answer:

Raul's mistake was in step 2

Step-by-step explanation:

Step 1 ;

$3+5-7$

Step 2 :

$3+2$

This was where Raul made a mistake

5-7 = -2 not +2

So the correct workings are ;

$3+5-7\\\\3-2\\\\=1$