Question 295676
{{{-2a+18/19 - 4a-5/9 - a+5/9 =0}}}
First gather like terms and simplify,
{{{(-2a-4a-a)+(18/19-cross(5/9)+cross(5/9)) =0}}}
{{{(-7a)+(18/19)=0}}}
Now move all non-a terms to the right side.
{{{-7a=-18/19}}}
Divide both sides by {{{-7}}}.
{{{a=18/(7*19)}}}
{{{a=18/133}}}