3/5=4.2/x

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Solution for 3/5=4.2/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/5 = 4.2/x // - 4.2/x

3/5-(4.2/x) = 0

3/5-4.2*x^-1 = 0

-4.2*x^-1 = -3/5 // : -4.2

x^-1 = 0.14285714

-1 < 0

1/(x^1) = 0.14285714 // * x^1

1 = 0.14285714*x^1 // : 0.14285714

7.00000014 = x^1

x = 7.00000014

x = 7.00000014

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