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D( x )
(3*x-7)^2 = 0
3*x-7 = 0
(3*x-7)^2 = 0
(3*x-7)^2 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x in (-oo:7/3) U (7/3:+oo)
5/(3*x-7)+2 = -2/((3*x-7)^2) // + -2/((3*x-7)^2)
5/(3*x-7)-(-2/((3*x-7)^2))+2 = 0
5/(3*x-7)+2*(3*x-7)^-2+2 = 0
5/(3*x-7)+2/((3*x-7)^2)+2 = 0
(5*(3*x-7))/((3*x-7)^2)+2/((3*x-7)^2)+(2*(3*x-7)^2)/((3*x-7)^2) = 0
5*(3*x-7)+2*(3*x-7)^2+2 = 0
18*x^2+15*x-84*x-33+98 = 0
18*x^2-69*x+65 = 0
18*x^2-69*x+65 = 0
18*x^2-69*x+65 = 0
DELTA = (-69)^2-(4*18*65)
DELTA = 81
DELTA > 0
x = (81^(1/2)+69)/(2*18) or x = (69-81^(1/2))/(2*18)
x = 13/6 or x = 5/3
(x-5/3)*(x-13/6) = 0
((x-5/3)*(x-13/6))/((3*x-7)^2) = 0
((x-5/3)*(x-13/6))/((3*x-7)^2) = 0 // * (3*x-7)^2
(x-5/3)*(x-13/6) = 0
( x-13/6 )
x-13/6 = 0 // + 13/6
x = 13/6
( x-5/3 )
x-5/3 = 0 // + 5/3
x = 5/3
x in { 13/6, 5/3 }
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