Simplify 5a- 3b - a+2b

4a-b

To simplify the expression 5a - 3b - a + 2b, combine like terms by adding or subtracting coefficients of the same variable.

First, combine the terms with the variable "a":
5a - a = 4a

Next, combine the terms with the variable "b":
-3b + 2b = -b

The simplified expression is then:
4a - b