$$\left. \begin{array} { l } { x + 13 = 00 x - 10 = 0 } \\ { x = - 13 x + 12 } \\ { 10 x ^ { 2 } = 9 \text { t h e q u a d r a t i e c y a l a t i o n c u k e c o n c e s e n c e r t o e t o e r \right.$$
$x=-23$
$$x+13=0x-10$$
$$x+13=0-10$$
$$x+13=-10$$
$$x=-10-13$$
$$x=-23$$
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