Question 898959
{{{A+B=180}}}
{{{A=3B+28}}}
Substitute,
{{{3B+28+B=180}}}
{{{4B=152}}}
{{{4B=152}}}
{{{B=38}}}
Then,
{{{A=3(38)+28}}}
{{{A=114+28}}}
{{{A=142}}}