Question

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a+ 1+2a

3b -b +2b

4[c - 1]

2d +4/2

2ab - 3ab -10ab

- 12ab+[-ab +2ab]

Answer 1

a+ 1+2a = 3a + 1

3b -b +2b = 4b

4[c - 1] = 4c - 4

2d +4/2 = 2d + 2

2ab - 3ab -10ab = -11ab

- 12ab+[-ab +2ab] = -12ab -ab + 2ab = -11ab