Question

Three more than the product of a number 4 is 15

Answer 1

X=3    
4 times three is 12 plus three is 15

Answer 2

3+4x=15 
4x=15-3
4x=12
x=12/4
x=3

The check is:

If x=3 then, 

3+ (4 X 3)=15

3+12=15