Question

what is 9z+2=6z-10-z-4 we have to do something called railroad tracks where we put lines down the sides of the equal sign but I am confused on this one.

Answer 1

You want to solve for 'z'.
First combine like terms on either side of the equal sign.

Left side:  9z +2  ----> No like terms, leave alone

Right side: 6z - 10 -z - 4  ----> circle like terms and add
                    6z -z = 5z
                   -10 -4 = -14
Now the equation is:
9z + 2 = 5z - 14

Get all the 'z' terms on the left side and all the numbers on right side.
You can move a term to the other side if you flip the sign.

Move 5z to left side, flip the sign to -5z
Move '2' to right side, flip the sign to -2

9z - 5z = -2 -14

Add like terms
4z = -16

Divide by 4 on both sides
z = -4