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D( x )
7*x^2-2 = 0
7*x^2-2 = 0
7*x^2-2 = 0
7*x^2 = 2 // : 7
x^2 = 2/7
x^2 = 2/7 // ^ 1/2
abs(x) = (2/7)^(1/2)
x = (2/7)^(1/2) or x = -(2/7)^(1/2)
x in (-oo:-(2/7)^(1/2)) U (-(2/7)^(1/2):(2/7)^(1/2)) U ((2/7)^(1/2):+oo)
((2*x-3)^5)/(7*x^2-2) = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in { 3/2, 3/2, 3/2, 3/2, 3/2 }
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