U= vw + z, for v i need the answers how u get it

Whenever you're solving for a variable, you want to isolate the variable, or get it by itself. start by subtracting z from both sides:

u=vw+z
-z      -z

u-z=vw

Then, divide both sides by w

u-z=vw
/w    /w

Leaving you with (u-z)/ w = v

(the u-z doesn't need to be in parenthesis, I'm using it to demonstrate that the expression u-z is being divided by w, instead of just one.