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D( x )
x-7 = 0
(x-7)^2 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
(x-7)^2 = 0
(x-7)^2 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:7) U (7:+oo)
2 = 6/((x-7)^2)-4/(x-7) // - 6/((x-7)^2)-4/(x-7)
2-(-4/(x-7))-(6/((x-7)^2)) = 0
4*(x-7)^-1-6*(x-7)^-2+2 = 0
4/(x-7)-6/((x-7)^2)+2 = 0
(4*(x-7))/((x-7)^2)-6/((x-7)^2)+(2*(x-7)^2)/((x-7)^2) = 0
4*(x-7)+2*(x-7)^2-6 = 0
2*x^2+4*x-28*x-34+98 = 0
2*x^2-24*x+64 = 0
2*x^2-24*x+64 = 0
2*(x^2-12*x+32) = 0
x^2-12*x+32 = 0
DELTA = (-12)^2-(1*4*32)
DELTA = 16
DELTA > 0
x = (16^(1/2)+12)/(1*2) or x = (12-16^(1/2))/(1*2)
x = 8 or x = 4
2*(x-4)*(x-8) = 0
(2*(x-4)*(x-8))/((x-7)^2) = 0
(2*(x-4)*(x-8))/((x-7)^2) = 0 // * (x-7)^2
2*(x-4)*(x-8) = 0
( x-4 )
x-4 = 0 // + 4
x = 4
( x-8 )
x-8 = 0 // + 8
x = 8
x in { 4, 8 }
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