Question 1078036
*[illustration PS1.JPG].
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{{{A[4]+A[2]+A[5]=180}}}
{{{44+A[2]+76=180}}}
Solve for {{{A[2]}}}.
Then,
{{{A[1]+A[5]+A[2]=180}}}
Now solve for {{{A[1]}}}.
And finally, 
{{{A[1]+A[2]+A[3]=180}}}
Now solve for {{{A[3]}}}.