It is not the same.
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No. Substitute the value 8 for x, and you have 4x +6 = 4(8) +6 = 32 +6 = 38.
x - 2 = 4x + 46-2 = 3x + 46-48 = 3xx = -48/3 or -16
(4x + 6)(4x - 6)
4x + 2 + 6 = 2 4x + 8 = 2 4x = -6 x = -6/4 = -3/2
If you mean: 3x-(2x+4x-6) then 3x-2x-4x+6 simplifies to 6-3x