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\frac{2304}{25}+\left(x-\frac{36}{5}\right)^{2}=x^{2}
Calculate \frac{48}{5} to the power of 2 and get \frac{2304}{25}.
\frac{2304}{25}+x^{2}-\frac{72}{5}x+\frac{1296}{25}=x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-\frac{36}{5}\right)^{2}.
144+x^{2}-\frac{72}{5}x=x^{2}
Add \frac{2304}{25} and \frac{1296}{25} to get 144.
144+x^{2}-\frac{72}{5}x-x^{2}=0
Subtract x^{2} from both sides.
144-\frac{72}{5}x=0
Combine x^{2} and -x^{2} to get 0.
-\frac{72}{5}x=-144
Subtract 144 from both sides. Anything subtracted from zero gives its negation.
x=-144\left(-\frac{5}{72}\right)
Multiply both sides by -\frac{5}{72}, the reciprocal of -\frac{72}{5}.
x=10
Multiply -144 and -\frac{5}{72} to get 10.