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D( i )
3-i = 0
3-i = 0
3-i = 0
3-i = 0 // - 3
-i = -3 // * -1
i = 3
i in (-oo:3) U (3:+oo)
(10*i)/(3-i) = (10*i)/3-i // - (10*i)/3-i
(10*i)/(3-i)-((10*i)/3)+i = 0
(10*i)/(3-i)+(-10/3)*i+i = 0
(10*i)/(3-i)+(-10*i)/3+i = 0
(3*10*i)/(3*(3-i))+(-10*i*(3-i))/(3*(3-i))+(3*i*(3-i))/(3*(3-i)) = 0
3*i*(3-i)-10*i*(3-i)+3*10*i = 0
10*i^2-3*i^2+9*i = 0
7*i^2+9*i = 0
7*i^2+9*i = 0
i*(7*i+9) = 0
7*i+9 = 0 // - 9
7*i = -9 // : 7
i = -9/7
i*(i+9/7) = 0
(i*(i+9/7))/(3*(3-i)) = 0
(i*(i+9/7))/(3*(3-i)) = 0 // * 3*(3-i)
i*(i+9/7) = 0
( i+9/7 )
i+9/7 = 0 // - 9/7
i = -9/7
( i )
i = 0
i in { -9/7, 0 }
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