Question 616792
You must give the unknown number a letter that represents it so let us call the number 'a'

therefore:

2 times 'a' = 8

this should be written as so:

2a = 8

then you want to find a so in this case you can divide the 2a by 2 to get a, but when you do so all numbers on both sides have to be divided by 2 to keep the equation balanced:

{{{2a/2 = 8/2}}}

which then gives:

a = 4

so the unknown number is 4.