Finding the value of the variable by trail and error method.
$x-6=15$

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Solution

Finding the value of $x$ is
Value of $x$
L.H.S $=x-6$
R.H.S $=15$
L.H.S $=$ R.H.S (Yes/No)
$0$
$0-6=-6$
$15$
NO
$10$
$10-6=4$
$15$
NO
$21$
$21-6=15$
$15$
YES
$20$
$20-6=14$
$15$
NO
Hence the value of $x$ is $21$

Value of $x$	L.H.S $=x-6$	R.H.S $=15$	L.H.S $=$ R.H.S (Yes/No)
$0$	$0-6=-6$	$15$	NO
$10$	$10-6=4$	$15$	NO
$21$	$21-6=15$	$15$	YES
$20$	$20-6=14$	$15$	NO

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