7/10=28/x

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Solution for 7/10=28/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/10 = 28/x // - 28/x

7/10-(28/x) = 0

7/10-28*x^-1 = 0

-28*x^-1 = -7/10 // : -28

x^-1 = 1/40

-1 < 0

1/(x^1) = 1/40 // * x^1

1 = 1/40*x^1 // : 1/40

40 = x^1

x = 40

x = 40

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