10/30=40/n

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Solution for 10/30=40/n equation: 


D( n )

n = 0

n = 0

n = 0

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

10/30 = 40/n // - 40/n

10/30-(40/n) = 0

10/30-40*n^-1 = 0

-40*n^-1 = -1/3 // : -40

n^-1 = 1/120

-1 < 0

1/(n^1) = 1/120 // * n^1

1 = 1/120*n^1 // : 1/120

120 = n^1

n = 120

n = 120

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