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(4.95^-4*x)/7 = 13 // - 13
(4.95^-4*x)/7-13 = 0
((4.95^-4)/7)*x-13 = 0 // + 13
((4.95^-4)/7)*x = 13 // : (4.95^-4)/7
x = 13/((4.95^-4)/7)
x = 91*4.95^4
x = 91*4.95^4
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