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D( x )
(5/2)*x-7 = 0
(5/2)*x-7 = 0
(5/2)*x-7 = 0
5/2*x-7 = 0 // + 7
5/2*x = 7 // : 5/2
x = 7/5/2
x = 14/5
x in (-oo:14/5) U (14/5:+oo)
(3-((5/2)*x))/((5/2)*x-7) = 0
((-5/2)*x+3)/((5/2)*x-7) = 0
(3-5/2*x)/(5/2*x-7) = 0
3-5/2*x = 0 // - 3
-5/2*x = -3 // : -5/2
x = -3/(-5/2)
x = 6/5
x = 6/5
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