$new_frac => {
    numerator => "5/3 + 7/13",
    denominator => "5/2 - 3/7"
}

##</code><code>##

$new_frac => {
    numerator => {
        numerator => 86,
        denominator => 39
    },
    denominator => {
        numerator => 29,
        denominator => 14
    }
}