7y - 3x - 2y is equivalent to 5y - 3x.
You must combine like terms. Since 7y and - 2y have like terms, we could combine them by subtracting 2y from 7y, leaving you with 5y.
7y - 3x - 2y
= 7y - 2y - 3x
= 5y - 3x.
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