Question 671446
2x + 3[x-2(9+x)]
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2x + 3[x-2(9) - 2(x)]
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2x + 3[x-18-2x]
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2x + 3[-x - 18]
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2x + 3(-x) + 3(-18)
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2x - 3x - 54
...
{{{highlight_green(-x - 54)}}}
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