((3x-21)/(6x-6))*((x^2-1)/(x^2-49))

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Solution for ((3x-21)/(6x-6))*((x^2-1)/(x^2-49)) equation: 


D( x )

6*x-6 = 0

x^2-49 = 0

6*x-6 = 0

6*x-6 = 0

6*x-6 = 0 // + 6

6*x = 6 // : 6

x = 6/6

x = 1

x^2-49 = 0

x^2-49 = 0

1*x^2 = 49 // : 1

x^2 = 49

x^2 = 49 // ^ 1/2

abs(x) = 7

x = 7 or x = -7

x in (-oo:-7) U (-7:1) U (1:7) U (7:+oo)

((3*x-21)/(6*x-6))*((x^2-1)/(x^2-49)) = 0

((3*x-21)*(x^2-1))/((6*x-6)*(x^2-49)) = 0

( 3*x-21 )

3*x-21 = 0 // + 21

3*x = 21 // : 3

x = 21/3

x = 7

( x^2-1 )

1*x^2 = 1 // : 1

x^2 = 1

x^2 = 1 // ^ 1/2

abs(x) = 1

x = 1 or x = -1

x in { 7} 

x in { 1} 

x = -1

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