The problem
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why does the last y have to be moved before the 9 in second line?
Answer provided by our tutors
It doesn't change anything if we write '- y + 9' instead of '9 - y' since:
9 - y = - y + 9
why does the last y have to be moved before the 9 in second line?
It doesn't change anything if we write '- y + 9' instead of '9 - y' since:
9 - y = - y + 9
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