Free 31 points. But you HAVE to answer this question

How do i work this problem out using the equation a=pe^rt

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles