You can put this solution on YOUR website!
Well, this problem is rather easy if you understand the question.
Let the number be x.
If 8 is add to twice the number and this sum is multiplied by five -> this equals to (8 + 2*x)*5
If the number is multiplied by five and 10 is added to the product -> this equals to 5*x + 10.
As told in the question, the first result is equal to the second result, which means:
(8+2*x)*5 = 5*x + 10
<-> 40 + 10*x = 5x + 10
<-> 5*x = -30
<-> x = -6.
So the number is -6. Clear, right?