Question
Subtract the second expression from the first:
2a + b, a + b
2a + b, a + b
✓
Answer
(2a + b) - (a + b)
= 2a + b - a - b
= 2a - a + b - b
= a + 0 = a
= 2a + b - a - b
= 2a - a + b - b
= a + 0 = a
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