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Equations

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linear equation
$$ \begin{aligned} ax + b &= 0 \end{aligned} $$
quadratic equation
$$ \begin{aligned} ax^2 + bx + c &= 0 \end{aligned} $$
system of linear equations
$$ \begin{aligned} ax + by + c &= 0 \\ dx + ey + f &= 0 \end{aligned} $$

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