Answer:
x = 10
Explanation:
We are given the following equation:
 ,
,
and told to find 
 .
.
In order to calculate the value of 
 , we have to rearrange the equation to make
, we have to rearrange the equation to make 
 the subject:
 the subject:

⇒ 
 [Distributing 5 into the brackets]
 [Distributing 5 into the brackets]
⇒ 

⇒ 

⇒ 
 [Subtracting 15 from both sides of equation]
 [Subtracting 15 from both sides of equation]
⇒ 

⇒ 
 [Dividing both sides of equation by 18]
 [Dividing both sides of equation by 18]
⇒ 

Therefore, the value of x is 10.