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2x - (1 - 6x) = 15
2x - 1 + 6x = 15
2x + 6x = 15 - 1
7x = 14
x = 14/7
x = 2
..........................................................
9 - (2m - 3) = 20 - 4m
9 - 2m + 3 = 20 - 4m
9 + 3 - 20 = - 4m + 2m
12 - 20 = - 2m
- 8 = - 2m
- 8 (-) = 2m
8 = 2m
8/2 = m
4 = m