Question
Add: $3a - 2b + 5c, 2a + 5b - 7c, - a - b + c$
✓
Answer
$3a - 2b + 5c, 2a + 5b - 7c, - a - b + c$
$ = 3a - 2b + 5c, 2a + 5b - 7c, -a - b + c $
$= (3a + 2a - a) - (2b - 5b + b) + (5c - 7c + c) $
$= 4a - (3b - 5b) + (6c - 7c) $
$= 4a + 2b - c$
$ = 3a - 2b + 5c, 2a + 5b - 7c, -a - b + c $
$= (3a + 2a - a) - (2b - 5b + b) + (5c - 7c + c) $
$= 4a - (3b - 5b) + (6c - 7c) $
$= 4a + 2b - c$
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