$$45^2-69x+18 = 0$$
Answer
$$ x = \frac{681}{23} $$
Explanation
$$ \begin{aligned} 45^2-69x+18 &= 0&& \text{simplify left side} \\[1 em]2025-69x+18 &= 0&& \\[1 em]-69x+2043 &= 0&& \text{ move the constants to the right } \\[1 em]-69x &= -2043&& \text{ divide both sides by $ -69 $ } \\[1 em]x &= \frac{-2043}{-69}&& \\[1 em]x &= \frac{681}{23}&& \\[1 em] \end{aligned} $$
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