Which is not a like term in the expression 7x +3 - 4 x-x

3 is not a like term because it isn't an x term, it doesn't have an x variable while the other terms do.

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2