The error holly made is instead of -6n there is -20n and in place of 3mn there is 9mn.
An equation is a mathematical statement that is made up of two expressions connected by an equal sign.
Given: (11m – 13n + 6mn) – (10m – 7n + 3mn)
= 11m – 13n + 6mn -10m +7n - 3mn
= 11m- 10m -13n + 7n + 6mn - 3mn
=m - 6n + 3mn
Hence, the correct answer is m - 6n + 3mn
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