Question 836669
Start at as far inside the grouping symbols as can be reached and calculate outward therefrom.



{{{14m-2 (3+5m-(6-(m-2)))=-10}}}
{{{14m-2(3+5m-(6-m+2))=-10}}}
{{{14m-2(3+5m-6+m-2)=-10}}}
{{{14m-2(6m-5)=-10}}}
{{{14m-12m+10=-10}}}
{{{2m=-20}}}
{{{m=-10}}}