Convert a gams equation into latex code
Examples
x <- "eq_1 .. v_a =e= sum(j,v_b(j)*((1-s_c)+sum(cell(i,j),v_d(i)/f_d(i))));"
cat(gamsequation2tex(x))
#> \begin{multline*}
#> v\_a = \sum_{j}\left(v\_b(j) \cdot \left(\left(1-s\_c\right)+\sum_{cell(i,j)}\left(\frac{v\_d(i)}{f\_d(i)}\right)\right)\right)
#> \end{multline*}