40/10=20/a

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Solution for 40/10=20/a equation: 


D( a )

a = 0

a = 0

a = 0

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

40/10 = 20/a // - 20/a

40/10-(20/a) = 0

40/10-20*a^-1 = 0

-20*a^-1 = -4 // : -20

a^-1 = 1/5

-1 < 0

1/(a^1) = 1/5 // * a^1

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

5 = a^1

a = 5

a = 5

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