8x-12 = 5+15
8x-12 = 20
8x = 32 +12
x = 4 ÷8
Let the number of History books be x. Then:-
x + x - 59 = 343
2x = 402
x = 201
So there are 201 History books and (201 - 59) = 142 Chemistry books.
The value of this expression is 
In order to find this, you divide each term separately. First we'll start with the numbers in the front.

Now that we have the first number, we look to the 10s and the powers they are raised to. Since we are looking at powers of the same number, we can use the properties of exponents to simply subtract the numbers they are raised to.

Then we put the two back together for the final answer.

Answer:
(5, 180)
Step-by-step explanation:
You use 5(z) and multiply it by 36 to get 180(y)
where's the rest of the question