Final answer to the problem
$x=24$
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1
Apply the formula: $x+a=b$$\to x+a-a=b-a$, where $a=-9$, $b=15$, $x+a=b=x-9=15$ and $x+a=x-9$
$x-9+9=15+9$
2
Apply the formula: $x+a+c=b+f$$\to x=b-a$, where $a=-9$, $b=15$, $c=9$ and $f=9$
$x=24$
Final answer to the problem
$x=24$
