Question

2w+w+2w+w=42 I don't understand how to get the answer

Answer 1

Just so u know, when u have just the variable (w), it is the same as 1w...although the " 1 " is not written, just understood to be there.

2w + w + 2w + w = 42...combine like terms
6w = 42...now divide both sides by 6
(6/6)w = 42/6
1w (or just w) = 7

Answer 2

First you combine the like terms which are the Ws.
And if there's no number in front of the variable (w in this case) it