Answer: 
Step-by-step explanation:
You can reduce the fractions, then:



Rewrite them as following:

If you subtract the first number and the second number, you obtain:

If you subtract the second number and the second number, you obtain:

Therefore, you must subtract
and
to obtain the number asked. Then, this is:

Answer:
X= 7
Step-by-step explanation:
The first blank is 69 degrees
a=1 b= c=Step-by-step explanation:
Multiply the tops and multiply the bottoms
Aka
5*21
-------
7*25
And simplify