Question 773212
Did you write a dash or a negative sign? 
{{{-2(x+6)=x+3-(-2x)}}}
{{{-2x-12=x+3+2x}}}
{{{-12=2x+x+3+2x}}}
{{{-12=5x+3}}}
{{{-12-3=5x}}}
{{{5x=-15}}}
{{{x=-3}}}


If the dash was not meant as a negative sign, then appropriate new steps would be done instead.