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D( x )
x < 0
x < 0
x in <0:+oo)
(35/4)*x^(3/2)-70 = 0
35/4*x^(3/2) = 70 // : 35/4
x^(3/2) = 8
x^(3/2) = 8 // ^ 2
x^3 = 64 // ^ 1/3
x = 4
x = 4
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