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D( x )
2*x-13 = 0
2*x-13 = 0
2*x-13 = 0
2*x-13 = 0 // + 13
2*x = 13 // : 2
x = 13/2
x in (-oo:13/2) U (13/2:+oo)
12 = 0.75/(2*x-13) // - 0.75/(2*x-13)
12-(0.75/(2*x-13)) = 0
12-0.75*(2*x-13)^-1 = 0
12-0.75/(2*x-13) = 0
(12*(2*x-13))/(2*x-13)-0.75/(2*x-13) = 0
12*(2*x-13)-0.75 = 0
24*x-156.75 = 0
(24*x-156.75)/(2*x-13) = 0
(24*x-156.75)/(2*x-13) = 0 // * 2*x-13
24*x-156.75 = 0
24*x-156.75 = 0 // + 156.75
24*x = 156.75 // : 24
x = 156.75/24
x = 6.53125
x = 6.53125
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