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D( x )
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
(12-7*x)/(2*x-5) = 0
12-7*x = 0 // - 12
-7*x = -12 // : -7
x = -12/(-7)
x = 12/7
x = 12/7
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