4/7=21/(x-3)

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Solution for 4/7=21/(x-3) equation: 


D( x )

x-3 = 0

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

x in (-oo:3) U (3:+oo)

4/7 = 21/(x-3) // - 21/(x-3)

4/7-(21/(x-3)) = 0

4/7-21*(x-3)^-1 = 0

4/7-21/(x-3) = 0

(-21*7)/(7*(x-3))+(4*(x-3))/(7*(x-3)) = 0

4*(x-3)-21*7 = 0

4*x-159 = 0

(4*x-159)/(7*(x-3)) = 0

(4*x-159)/(7*(x-3)) = 0 // * 7*(x-3)

4*x-159 = 0

4*x-159 = 0 // + 159

4*x = 159 // : 4

x = 159/4

x = 159/4

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