Question 266241
Don't let it all run together like oatmeal.
Separate it into smaller groups:
The sum of 
twice a number
plus
four times another number
-------------------------
You have to have some letter
that stands for "a number"
Call it {{{a}}}
Twice is {{{2a}}}
So far I have {{{2a}}} +
Call the other number {{{b}}}
Four times {{{b}}} is {{{4b}}}
I now have
{{{2a + 4b}}}