\left\{ \begin{array} { l } { 7 q - 5 r < 30 } \\ { 5 q + 7 r \leq 42 } \end{array} \right.
Solve for r
r\in (\frac{7q}{5}-6,-\frac{5q}{7}+6]\text{, }q<\frac{210}{37}
Solve for q
\left\{\begin{matrix}q\leq \frac{42-7r}{5}\text{, }&r>\frac{72}{37}\\q<\frac{5r+30}{7}\text{, }&r\leq \frac{72}{37}\end{matrix}\right.
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