$$\left. \begin{array} { l } { x - \frac { 8 } { 7 } x + 2 = 1 } \\ { 10 : } \end{array} \right.$$
$x=7$
$$-\frac{1}{7}x+2=1$$
$$-\frac{1}{7}x=1-2$$
$$-\frac{1}{7}x=-1$$
$$x=-\left(-7\right)$$
$$x=7$$
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