Answer:

Step-by-step explanation:
1) Given the equation:

You can rewrite it in the following form:

You must solve for "z". To do it, you can multiply both sides of the equation by 12.
Then you get this solution:

2) The equation given is:

Now, in order to solve for the variable "g", you can divide both sides of the equation by 5.
Then you get the following result:

3) Given the equation:

You can solve for "d" adding 21 to both sides of the equation.
So the value of "d" is:

4) Having this equation:

You must subtract 35 from both sides of the equation in order to find the value of the variable "r".
This is:
