\left\{ \begin{array} { l } { 3 ( a + b ) - m ( a - b ) = 5 } \\ { 2 a + b + n ( a - b ) = b } \end{array} \right.
Solve for a, b, m, n
a=-\frac{bm+3b-5}{3-m}\text{, }b\neq \frac{5}{6}\text{, }m\neq 3\text{, }n=-\frac{2\left(bm+3b-5\right)}{6b-5}
a\neq \frac{5}{6}\text{, }b=\frac{5}{6}\approx 0.833333333\text{, }m=3\text{, }n=-\frac{12a}{6a-5}
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