$$\left. \begin{array} { l } { \frac { 4 } { 5 } - y = 12 y - \frac { 6 } { 7 } } \\ { ? } \end{array} \right.$$
$y=\frac{58}{455}\approx 0.127472527$
$$\frac{4}{5}-y-12y=-\frac{6}{7}$$
$$\frac{4}{5}-13y=-\frac{6}{7}$$
$$-13y=-\frac{6}{7}-\frac{4}{5}$$
$$-13y=-\frac{30}{35}-\frac{28}{35}$$
$$-13y=\frac{-30-28}{35}$$
$$-13y=-\frac{58}{35}$$
$$y=\frac{-\frac{58}{35}}{-13}$$
$$y=\frac{-58}{35\left(-13\right)}$$
$$y=\frac{-58}{-455}$$
$$y=\frac{58}{455}$$
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