25 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$RE=\frac{{{x_p} - {x_m}}}{{{x_m}}} \times 100\%$$\end{document} Results and discussion Given that the computational expense of actual reservoir models is quite significant and even utilizing computers with robust processors does not resolve this, reservoir engineers tend to generate several run modes.
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