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a)
3(2x - 1) + 4(x + 1)
6x - 3 + 4x + 4
6x + 4x + 4 - 3
10x + 1
....................................................
b)
- 2(x + 3) + 3(2x + 2)
- 2x - 6 + 6x + 6
- 2x + 6x - 6 + 6
4x