For this case we have the following equation: 
 

 From here, we must clear the value of y. 
 For this, we follow the following steps: 
 1) Distributive property: 
 

 2) Variable terms on one side of the equation and constant terms on the other side of the equation: 
 

 3) Algebraically add the constant terms:
 

 4) Pass the number 20 to divide: 
 

 Answer: 
 The value of y is given by: 
 
