Question

If 5 is added to a number the sum is 7 less than twice the number.find the number

Answer 1

Let the number be x Acc.  To the question- X+5=2x-7 =>5+7=2x-x =>12=x

Answer 2

Let the number be x.

Therefore, ATQ,
$5 + x = {x}^{2} - 7$
or
$5 + 7 = {x }^{2} - x$
or
$12 = {x}^{2} - x$
or
$- {x}^{2} - x = - 12$
. . .