The problem
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hello, I do not understand why the 5 disappeared in the second step of the problem.
Answer provided by our tutors
To see more steps, and more step by step solution, go to 'Options', select 'Show: a lot of steps' and click 'Apply':
Now you see a more step by step solution with explanations (do not forget that you can obtain an explanation for any step by just clicking on it):
