Under & overbracket

$\underbrace{u'-P(x)u^2-Q(x)u-R(x)}_{\text{=0, since~$u$ is a particular solution.}}$

$\underbracket{u'-P(x)u^2-Q(x)u-R(x)}_{\text{=0, since~$u$ is a particular solution.}}$

$\overbrace{a+b+c}^{d} \quad \overbracket{a+b+c}^{d} \quad \underbrace{a+b+c}_{d} \quad \underbracket{a+b+c}_{d}$

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This work (Math Test by Morty Morterson and carl123) is free of known copyright restrictions.