30/42=1020/x

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Solution for 30/42=1020/x equation: 


D( x )

x = 0

x = 0

x = 0

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

30/42 = 1020/x // - 1020/x

30/42-(1020/x) = 0

30/42-1020*x^-1 = 0

-1020*x^-1 = -5/7 // : -1020

x^-1 = 1/1428

-1 < 0

1/(x^1) = 1/1428 // * x^1

1 = 1/1428*x^1 // : 1/1428

1428 = x^1

x = 1428

x = 1428

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