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D( x )
18*x-6 = 0
18*x-6 = 0
18*x-6 = 0
18*x-6 = 0 // + 6
18*x = 6 // : 18
x = 6/18
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
3/10 = (5*x+1)/(18*x-6) // - (5*x+1)/(18*x-6)
3/10-((5*x+1)/(18*x-6)) = 0
(-1*(5*x+1))/(18*x-6)+3/10 = 0
(-1*10*(5*x+1))/(10*(18*x-6))+(3*(18*x-6))/(10*(18*x-6)) = 0
3*(18*x-6)-1*10*(5*x+1) = 0
4*x-28 = 0
(4*x-28)/(10*(18*x-6)) = 0
(4*x-28)/(10*(18*x-6)) = 0 // * 10*(18*x-6)
4*x-28 = 0
4*x-28 = 0 // + 28
4*x = 28 // : 4
x = 28/4
x = 7
x = 7
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