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8-\left(4+\sqrt{16+8x}\right)=4
Multiply both sides of the equation by 2.
8-4-\sqrt{16+8x}=4
To find the opposite of 4+\sqrt{16+8x}, find the opposite of each term.
4-\sqrt{16+8x}=4
Subtract 4 from 8 to get 4.
-\sqrt{16+8x}=4-4
Subtract 4 from both sides.
-\sqrt{16+8x}=0
Subtract 4 from 4 to get 0.
\sqrt{16+8x}=0
Divide both sides by -1. Zero divided by any non-zero number gives zero.
8x+16=0
Square both sides of the equation.
8x+16-16=-16
Subtract 16 from both sides of the equation.
8x=-16
Subtracting 16 from itself leaves 0.
\frac{8x}{8}=-\frac{16}{8}
Divide both sides by 8.
x=-\frac{16}{8}
Dividing by 8 undoes the multiplication by 8.
x=-2
Divide -16 by 8.