$11\mathrm{.}9$ The following system of equations is designed to determine concentrations $($the $c^{\text{'}}s$ in $\frac{g}{m^3})$ in a series of

coupled reactors as a function of amount of mass input to each reactor $($the right$-$hand sides are in $\frac{g}{?}$ day$)$:

$15c_1-3c_2-c_3=3300$

$-3c_1+18c_2-6c_3=1200$

$-4c_1-c_2+12c_3=2400$

Solve this problem with the Gauss$-$Seidel method to ${}_5=5\%.$ use matlab instead of python please