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1. simplify 5(a - b) + 6(a + b) - 7(a - 2b)
4a - 13b
4a + 15b
19ab

2. simplify 5(x - 2) + 6
5x + 4
5x - 4
5x + 20

3. simplify 6(x - 3) - 4(x + 1)
2x - 22
2x - 14
2x - 2

4. simplify 7(x - 1) - 2(x + 1) + 3(x - 4)
8x - 21
8x - 4
8x + 21

5.10(x + 4) + 15(x + 1)
25x + 55
25x + 5
55x

6. simplify 7(9x - 3) - 4(2x - 1)
34x
55x - 17
55x - 25