simplify this

[teaspoon]

A teacher at my daughters school told her that this was correct.

that to simplify this equation 2m + 7 + 5m as 14m

? surely it's 7m + 7

 

[stapel]

A teacher at my daughters school told her that this was correct.

that to simplify this equation 2m + 7 + 5m as 14m

? surely it's 7m + 7

Assuming the "7" is correct (and not a typo for "7m"), yes, you are right.

 

[Ishuda]

A teacher at my daughters school told her that this was correct.

that to simplify this equation 2m + 7 + 5m as 14m

? surely it's 7m + 7

A
As written the expression simplifies to 7m+7 as stapel indicated. However had it been 2m+(7+5)m or, as staple pointed out, 2m+7m+5m the correct simplification would be 14m.