Solve the following system of equations with the substitution method:

$\displaystyle {\left\lbrace\begin{array}{ccc} {3}{x}-{5}{y}&=&-{6}\\-{5}{x}-{2}{y}&=&{6}\end{array}\right.}$

Answer: ( , )


Enter your answers as integers or as reduced fractions in the form A/B.