12 x + 9 - 1 = 8 x + 5 x + 10
12 x - 13 x = 10 - 8
- x = 2
x = - 2
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12 x + 9 - 1 = 8 x + 5 x + 10
12 x - 13 x = 10 - 8
- x = 2
x = - 2