The function w is defined by w(x)=6+3x. If 4⋅ w(z)=96, what is the value of z?

Question

So is w(x)=w(z)?

Answer 1

4w(z) = 4(6+3z) = 96
24+12z = 96
12z = 72
z = 6

the x in w(x) is just a placeholder.
w(x) = 6+3x
w(z) = 6+3z
w(12)= 6+3*12
and so on.