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D( x )
4*x = 0
28*x-12 = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
28*x-12 = 0
28*x-12 = 0
28*x-12 = 0 // + 12
28*x = 12 // : 28
x = 12/28
x = 3/7
x in (-oo:0) U (0:3/7) U (3/7:+oo)
(7*x)/(4*x)-((6*x)/(28*x-12)) = 0
(7*x)/(4*x)-6*x*(28*x-12)^-1 = 0
(-6*x)/(28*x-12)+7/4 = 0
(-6*4*x)/(4*(28*x-12))+(7*(28*x-12))/(4*(28*x-12)) = 0
7*(28*x-12)-6*4*x = 0
172*x-84 = 0
(172*x-84)/(4*(28*x-12)) = 0
(172*x-84)/(4*(28*x-12)) = 0 // * 4*(28*x-12)
172*x-84 = 0
172*x-84 = 0 // + 84
172*x = 84 // : 172
x = 84/172
x = 21/43
x = 21/43
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