20/a-1=4

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Solution for 20/a-1=4 equation: 


D( a )

a = 0

a = 0

a = 0

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

20/a-1 = 4 // - 4

20/a-4-1 = 0

20*a^-1 = 5 // : 20

a^-1 = 1/4

-1 < 0

1/(a^1) = 1/4 // * a^1

1 = 1/4*a^1 // : 1/4

4 = a^1

a = 4

a = 4

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