Tests

$\displaystyle \leqalignno{
\int v(t)\, dt &= u(t) + C&[3.1]\cr
\int v(t)\, dt &= u(t) + H&[3.2]\cr
}
$
$\displaystyle \leqalignno{
\int v(t)\, dt &= u(t) + C&[3.1]\cr
\int v(t)\, dt &= u(t) + H&[3.2]\cr
}
$

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