From is taking away not adding
3w + 6 take away 2w +4
= w + 2
For the other question, -3x + 4 take away 5x - 2
-3x take away 5x would be -8x
and
4 take away -2 would be 6
(2 negatives = a positive)
so the answer would be
-8x + 6
6.5m questions
8.7m answers