39/x+7=21/7

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Solution for 39/x+7=21/7 equation: 


D( x )

x = 0

x = 0

x = 0

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

39/x+7 = 21/7 // - 21/7

39/x-(21/7)+7 = 0

39/x-3+7 = 0

39*x^-1 = -4 // : 39

x^-1 = -4/39

-1 < 0

1/(x^1) = -4/39 // * x^1

1 = -4/39*x^1 // : -4/39

-39/4 = x^1

x = -39/4

x = -39/4

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