30/25=42/x

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Solution for 30/25=42/x equation: 


D( x )

x = 0

x = 0

x = 0

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

30/25 = 42/x // - 42/x

30/25-(42/x) = 0

30/25-42*x^-1 = 0

-42*x^-1 = -6/5 // : -42

x^-1 = 1/35

-1 < 0

1/(x^1) = 1/35 // * x^1

1 = 1/35*x^1 // : 1/35

35 = x^1

x = 35

x = 35

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