Final answer to the problem
$x=-16$
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1
Apply the formula: $x+a=b$$\to x+a-a=b-a$, where $a=7$, $b=-9$, $x+a=b=7+x=-9$ and $x+a=7+x$
$x+7-7=-9-7$
2
Apply the formula: $x+a+c=b+f$$\to x=b-a$, where $a=7$, $b=-9$, $c=-7$ and $f=-7$
$x=-16$
Final answer to the problem
$x=-16$
