Question

The expression -3m - [2m + (5 - m)] + 7 was simplified as 2 - 4m. Without simplifying, explain how you can show that it has been simplified correctly.

Answer 1

so -3m-2m-(-m)=-5m+m=-4m

and -(+5)+7=-5+7=2

so this mean that result -4m+2

ok ?

Answer 2

or 2-4m