7/12=42/x

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Solution for 7/12=42/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/12 = 42/x // - 42/x

7/12-(42/x) = 0

7/12-42*x^-1 = 0

-42*x^-1 = -7/12 // : -42

x^-1 = 1/72

-1 < 0

1/(x^1) = 1/72 // * x^1

1 = 1/72*x^1 // : 1/72

72 = x^1

x = 72

x = 72

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