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-2x+16 = 0 -2x = -16 x = 8
16+2x can not be simplified any further. 16+2x would normally be written as 2x+16 to keep the degrees of the terms in order from highest to lowest.
8x + 16 = 6x -> 2x + 16 = 0 -> 2x = -16 -> x = -8
-2 to the 4th power is 16.
It is: 10x^2 -4x = 2x(5x-2)