The work shows finding the sum of the algebraic expressions –3a + 2b and 5a + (–7b).

–3a + 2b + 5a + (–7b)

Step 1: –3a +5a+ 2b + (–7b)

Step 2: (–3 + 5)a + [2 + (–7)]b

Step 3: 2a + (–5b)

Which is used in each step to simplify the sum?

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