There is no attachment so we don’t know what this angle is.
Answer:
5*x-3=12
the number is 3 because 5*3=15 and 15-3=12
Answer:
Given:
1).
divided by 
⇒ 
⇒ 
By factorising numerator by using identity, 
⇒ 
⇒ 
⇒
<u> {Answer}</u>
2).
divided by 
⇒ 
⇒
⇒ <u>
</u> <u>{ Answer}</u>
Edited : I apologise I misunderstood the question.
You can solve the equation.