Question

Simplify the expression 4z-z+z-2z

Answer 1

I think
Z(4-2)=z(2)=2z

Answer 2

For this case we can do the following:

1) Take common factor z and we have:

z( 4-1+1-2)

2) Solve the numbers and we got:

z(4-2)= z(2)= 2z