21/7=18/x

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Solution for 21/7=18/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/7 = 18/x // - 18/x

21/7-(18/x) = 0

21/7-18*x^-1 = 0

-18*x^-1 = -3 // : -18

x^-1 = 1/6

-1 < 0

1/(x^1) = 1/6 // * x^1

1 = 1/6*x^1 // : 1/6

6 = x^1

x = 6

x = 6

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