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(6*e^2*x)/5-(9*e^3*x)+4 = 0
(6*e^2*x)/5-9*e^3*x+4 = 0
((6*e^2)/5-9*e^3)*x+4 = 0 // - 4
((6*e^2)/5-9*e^3)*x = -4 // : (6*e^2)/5-9*e^3
x = -4/((6*e^2)/5-9*e^3)
x = -4/((6*e^2)/5-9*e^3)
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