Question 1037395
You mean SIMPLIFY the expression?


{{{a-b-2a+4b-a+2b}}}

{{{a+(-b)+(-2a)+4b+(-a)+2b}}}, the meaning of subtraction

{{{a+(-2a)+(-a)+(-b)+4b+2b}}}, commutative property for addition

{{{-2a+5b}}}