Question 832053
Let your unknown number be "x"
The sum of your number and four is x+4, and twice the sum of that number and four will be 2(x+4) 
And you have thirty-eight equals that, so that means you have
2(x+4) = 38
let's solve
2(x+4) = 38
x+4 = 19
x = 15
So the value of your number is 15
TA-DAH