(7.1x * 5) - 9(13 - 0.8) = 6.7
35.5x - 9(12.2) = 6.7
35.5x - 109.8 = 6.7
35.5x = 116.5
x = 3.28169014
(7.1x * 5) - 9(13 - 0.8) = 6.7
35.5x - 9(12.2) = 6.7
35.5x - 109.8 = 6.7
35.5x = 116.5
x = 3.28169014