Question 1025642
Wow, couldn't edit your Google request? You need to make some effort.
{{{A[1]+A[2]=180}}}
{{{A[1]=A[2]+12}}}
Substitute,
{{{A[2]+12+A[2]=180}}}
{{{2A[2]+12=180}}}
Solve for {{{A[2]}}}, then use either equation to solve for {{{A[1]}}}