Question
$x + 9 = 13$

Answer

$x + 9 = 13$
Subtracting $9$ from both sides, we get
$\Rightarrow x + 9 - 9 = 13 – 9$
$\Rightarrow x = 4$
Verification:
Substituting $x = 4$ on $L.H.S.$, we get
$L.H.S. = 4 + 9 = 13 = R.H.S.$
$L.H.S. = R.H.S.$
Hence, verified.

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