$$\frac{ x+9 }{ 5 } = \frac{ x+7 }{ 10 }$$
$x=-11$
$$2\left(x+9\right)=x+7$$
$$2x+18=x+7$$
$$2x+18-x=7$$
$$x+18=7$$
$$x=7-18$$
$$x=-11$$
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