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It simplifies to: 6x
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-6 + 4x + (9-2x) = -6 + 4x + 9 - 2x = [ 3 + 2x ]
2x + 6x + 4x = 12x
4x + 2 + 2x - 2x = 14 4x = 14 - 2 4x = 12 x = 3
8x-2x+4x=10x
2x + 4x - x = 5x