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D( x )
3*x-14 = 0
3*x-14 = 0
3*x-14 = 0
3*x-14 = 0 // + 14
3*x = 14 // : 3
x = 14/3
x in (-oo:14/3) U (14/3:+oo)
(4/10)*x = 2/(3*x-14) // - 2/(3*x-14)
(4/10)*x-(2/(3*x-14)) = 0
(4/10)*x-2*(3*x-14)^-1 = 0
(2*x)/5-2/(3*x-14) = 0
(-2*5)/(5*(3*x-14))+(2*x*(3*x-14))/(5*(3*x-14)) = 0
2*x*(3*x-14)-2*5 = 0
6*x^2-28*x-10 = 0
6*x^2-28*x-10 = 0
2*(3*x^2-14*x-5) = 0
3*x^2-14*x-5 = 0
DELTA = (-14)^2-(-5*3*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+14)/(2*3) or x = (14-256^(1/2))/(2*3)
x = 5 or x = -1/3
2*(x+1/3)*(x-5) = 0
(2*(x+1/3)*(x-5))/(5*(3*x-14)) = 0
(2*(x+1/3)*(x-5))/(5*(3*x-14)) = 0 // * 5*(3*x-14)
2*(x+1/3)*(x-5) = 0
( 2 )
2 = 0
x belongs to the empty set
( x+1/3 )
x+1/3 = 0 // - 1/3
x = -1/3
( x-5 )
x-5 = 0 // + 5
x = 5
x in { -1/3, 5 }
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