(3X+1)/((9X+3)(3X+7))

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Solution for (3X+1)/((9X+3)(3X+7)) equation: 


D( X )

(9*X+3)*(3*X+7) = 0

(9*X+3)*(3*X+7) = 0

(9*X+3)*(3*X+7) = 0

( 3*X+7 )

3*X+7 = 0 // - 7

3*X = -7 // : 3

X = -7/3

( 9*X+3 )

9*X+3 = 0 // - 3

9*X = -3 // : 9

X = -3/9

X = -1/3

X in (-oo:-7/3) U (-7/3:-1/3) U (-1/3:+oo)

(3*X+1)/((9*X+3)*(3*X+7)) = 0

3*X+1 = 0 // - 1

3*X = -1 // : 3

X = -1/3

X in { -1/3} 

X belongs to the empty set

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