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(2.68^-5*x)/8 = 9 // - 9
(2.68^-5*x)/8-9 = 0
((2.68^-5)/8)*x-9 = 0 // + 9
((2.68^-5)/8)*x = 9 // : (2.68^-5)/8
x = 9/((2.68^-5)/8)
x = 72*2.68^5
x = 72*2.68^5
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