−3=z−8

Find what Z is

-3=z-8
Move the variable to the left side and change it’s sign

-z-3=-8
Move the constant to the right side and change its sign

-z=-8+3

Now you calculate the sum

-z=-5

Change both signs of the equation

z=5, therefore z=5 your answer.

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!

The answer should be c.