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D( x )
(4*x-7)^5 = 0
(4*x-7)^4 = 0
(4*x-7)^5 = 0
(4*x-7)^5 = 0
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
(4*x-7)^4 = 0
(4*x-7)^4 = 0
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x in (-oo:7/4) U (7/4:+oo)
1/((4*x-7)^4)-((16*x)/((4*x-7)^5)) = 0
1/((4*x-7)^4)-16*x*(4*x-7)^-5 = 0
1/((4*x-7)^4)+(-16*x)/((4*x-7)^5) = 0
(1*(4*x-7))/((4*x-7)^5)+(-16*x)/((4*x-7)^5) = 0
1*(4*x-7)-16*x = 0
-12*x-7 = 0
(-12*x-7)/((4*x-7)^5) = 0
(-12*x-7)/((4*x-7)^5) = 0 // * (4*x-7)^5
-12*x-7 = 0
-12*x-7 = 0 // + 7
-12*x = 7 // : -12
x = 7/(-12)
x = -7/12
x = -7/12
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