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\left(\frac{9}{2}-x\right)^{2}=x^{2}+\left(9-1\right)^{2}
Subtract \frac{9}{2} from 9 to get \frac{9}{2}.
\frac{81}{4}-9x+x^{2}=x^{2}+\left(9-1\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(\frac{9}{2}-x\right)^{2}.
\frac{81}{4}-9x+x^{2}=x^{2}+8^{2}
Subtract 1 from 9 to get 8.
\frac{81}{4}-9x+x^{2}=x^{2}+64
Calculate 8 to the power of 2 and get 64.
\frac{81}{4}-9x+x^{2}-x^{2}=64
Subtract x^{2} from both sides.
\frac{81}{4}-9x=64
Combine x^{2} and -x^{2} to get 0.
-9x=64-\frac{81}{4}
Subtract \frac{81}{4} from both sides.
-9x=\frac{175}{4}
Subtract \frac{81}{4} from 64 to get \frac{175}{4}.
x=\frac{\frac{175}{4}}{-9}
Divide both sides by -9.
x=\frac{175}{4\left(-9\right)}
Express \frac{\frac{175}{4}}{-9} as a single fraction.
x=\frac{175}{-36}
Multiply 4 and -9 to get -36.
x=-\frac{175}{36}
Fraction \frac{175}{-36} can be rewritten as -\frac{175}{36} by extracting the negative sign.