12x-{8x-2[4-(2x+1)-9]-11}=10X
12x - {8x - 2[4-2x-1-9] - 11} = 10 x
12x - {8x - 2[-2x -6] - 11} = 10x
12x - {8x + 4x + 12 - 11} = 10x
12x - {12x + 1} = 10x
12x - 12x - 1 = 10x
10x = -1
x = - 1/10
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