<?php
$conta = "5149.3074*{{INPUT}}^(0.0001)-5129.6906";
$primeiro = strpos($conta, "("); $segundo = strpos($conta, ")"); $valor = substr($conta, $primeiro + 1, $segundo - $primeiro - 1); echo $valor;
?>
PD9waHAKICAgICRjb250YSA9ICI1MTQ5LjMwNzQqe3tJTlBVVH19XigwLjAwMDEpLTUxMjkuNjkwNiI7CiAgICAkcHJpbWVpcm8gPSBzdHJwb3MoJGNvbnRhLCAiKCIpOwogICAgJHNlZ3VuZG8gPSBzdHJwb3MoJGNvbnRhLCAiKSIpOwogICAgJHZhbG9yID0gc3Vic3RyKCRjb250YSwgJHByaW1laXJvICsgMSwgJHNlZ3VuZG8gLSAkcHJpbWVpcm8gLSAxKTsKICAgIGVjaG8gJHZhbG9yOwo/Pg==