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x^{2}-4x+4-\left(x+2\right)^{2}+3=0
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-2\right)^{2}.
x^{2}-4x+4-\left(x^{2}+4x+4\right)+3=0
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}-4x+4-x^{2}-4x-4+3=0
To find the opposite of x^{2}+4x+4, find the opposite of each term.
-4x+4-4x-4+3=0
Combine x^{2} and -x^{2} to get 0.
-8x+4-4+3=0
Combine -4x and -4x to get -8x.
-8x+3=0
Subtract 4 from 4 to get 0.
-8x=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-3}{-8}
Divide both sides by -8.
x=\frac{3}{8}
Fraction \frac{-3}{-8} can be simplified to \frac{3}{8} by removing the negative sign from both the numerator and the denominator.