It can be simplified to: -14x+8 or 8-14x
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6x-9=39 so 6x=48 and 8x6=48 so x=8
4x+8
-x2 + 6x + 16 = -(x2 - 6x - 16) = -(x - 8)(x + 2) = -(8 - x)(x + 2)
6x+4=3x+12 => 6x-3x=12-4 => 3x=8 => x=8/3=2.666...
8+6x = ? 8+6*5 = ? 8+30 = ?