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x-4-\left(x+4\right)\times 2=4
Variable x cannot be equal to any of the values -4,4 since division by zero is not defined. Multiply both sides of the equation by \left(x-4\right)\left(x+4\right), the least common multiple of x+4,x-4,x^{2}-16.
x-4-\left(2x+8\right)=4
Use the distributive property to multiply x+4 by 2.
x-4-2x-8=4
To find the opposite of 2x+8, find the opposite of each term.
-x-4-8=4
Combine x and -2x to get -x.
-x-12=4
Subtract 8 from -4 to get -12.
-x=4+12
Add 12 to both sides.
-x=16
Add 4 and 12 to get 16.
x=-16
Multiply both sides by -1.