28/8=7/x

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Solution for 28/8=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

28/8 = 7/x // - 7/x

28/8-(7/x) = 0

28/8-7*x^-1 = 0

-7*x^-1 = -7/2 // : -7

x^-1 = 1/2

-1 < 0

1/(x^1) = 1/2 // * x^1

1 = 1/2*x^1 // : 1/2

2 = x^1

x = 2

x = 2

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