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c)
x - 9x = 9 - 7
- 8x = 2
x = 2/-8
x = -1/4
d)
5x - x = 3 - 5
4x = -2
x = -2/4
x = -1/2
e)
12x - 2x = 6
10x = 6
x = 6/10
x = 3/5
f)
x + 2x = 2 - 8
3x = -6
x = -6/3
x = -2