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Simplify : `3x-[4x+{2=6(x-bar(2-x))}]`

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Simplify : `3x-[4x+{2=6(x-bar(2-x))}]`
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Correct Answer - `9x-12`
`3x-[(4x+{2x-6(x-bar(2-x))}]`
`3x-[4x+{2x-6(x-2+x)}]`
`=3x-[4x+{2x-6x+12-6x}]`
`=3x-[4x-10x+12]`
`=3x+6x-12`
`=9x-12`
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