$$\left. \begin{array} { l } { ( m ) - 20 + ( 5 - 6 ) = - 20 ( m ) ( - 123 ) + ( - 1 ) = 125 } \\ { ( 0 ) a + ( - 7 ) = 8 , } \right.$$
$m=-\frac{20}{2459}\approx -0.008133388$
$$m-15-6=-20m\left(-123\right)-1$$
$$m-21=-20m\left(-123\right)-1$$
$$m-21=2460m-1$$
$$m-21-2460m=-1$$
$$-2459m-21=-1$$
$$-2459m=-1+21$$
$$-2459m=20$$
$$m=\frac{20}{-2459}$$
$$m=-\frac{20}{2459}$$
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