3/30=140/x

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Solution for 3/30=140/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/30 = 140/x // - 140/x

3/30-(140/x) = 0

3/30-140*x^-1 = 0

-140*x^-1 = -1/10 // : -140

x^-1 = 1/1400

-1 < 0

1/(x^1) = 1/1400 // * x^1

1 = 1/1400*x^1 // : 1/1400

1400 = x^1

x = 1400

x = 1400

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