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x\times 4=\left(x-4\right)^{2}-x\left(x-4\right)
Variable x cannot be equal to any of the values 0,4 since division by zero is not defined. Multiply both sides of the equation by x\left(x-4\right)^{2}, the least common multiple of x^{2}-8x+16,x,x-4.
x\times 4=x^{2}-8x+16-x\left(x-4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
x\times 4=x^{2}-8x+16-\left(x^{2}-4x\right)
Use the distributive property to multiply x by x-4.
x\times 4=x^{2}-8x+16-x^{2}+4x
To find the opposite of x^{2}-4x, find the opposite of each term.
x\times 4=-8x+16+4x
Combine x^{2} and -x^{2} to get 0.
x\times 4=-4x+16
Combine -8x and 4x to get -4x.
x\times 4+4x=16
Add 4x to both sides.
8x=16
Combine x\times 4 and 4x to get 8x.
x=\frac{16}{8}
Divide both sides by 8.
x=2
Divide 16 by 8 to get 2.