Question 126510
The number is x.


The sum of the number and -3 is then {{{x-3}}}


Double {{{x-3}}} is {{{2x-6}}}


1/2 times the number is {{{x/2}}}


So:  {{{2x-6=x/2}}}


{{{4x-12=x}}}
{{{3x-12=0}}}
{{{3x=12}}}
{{{x=4}}}


Check:

{{{4-3=1}}}
{{{1*2=2}}}


{{{4/2=2}}}, Answer checks.