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

Idon’t know this and this isn’t middle school work