(a-21)(a-29)(-40/a-29)

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Solution for (a-21)(a-29)(-40/a-29) equation: 


D( a )

a = 0

a = 0

a = 0

a in (-oo:0) U (0:+oo)

(a-21)*(a-29)*(-40/a-29) = 0

(a-21)*(a-29)*(-40*a^-1-29) = 0

( -40*a^-1-29 )

-40*a^-1 = 29 // : -40

a^-1 = -29/40

-1 < 0

1/(a^1) = -29/40 // * a^1

1 = -29/40*a^1 // : -29/40

-40/29 = a^1

a = -40/29

( a-21 )

a-21 = 0 // + 21

a = 21

( a-29 )

a-29 = 0 // + 29

a = 29

a in { -40/29, 21, 29 }

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