How do you simplify a variable for example: 4 - 3x - 2 + x

Using the commutativer property (a+b=b+a) we can more the numbers around to group the like terms (x with x and number with numbers

normally x is in front so

-3x+1x+4-2

group using associatie property which says (a+b) + c=a + (b+c)

(-3x+1x) + (4-2)

add liket erms

(-2x) + (2)

-2x+2 or

2-2x