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((7*(e^3*x)^2)/14)*e^x = 0
(7*(e^3*x)^2)/14 = 0
((e^6)/2)*x^2 = 0 // : (e^6)/2
x^2 = 0
x = 0
e^x = 0
x należy do O
((7*(e^3*x)^2)/14)*e^x = 0 <=> (7*(e^3*x)^2)/14 = 0 or ((7*(e^3*x)^2)/14)*e^x = 0 <=> e^x = 0
x = 0
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