7/(x+9)=21/36

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Solution for 7/(x+9)=21/36 equation: 


D( x )

x+9 = 0

x+9 = 0

x+9 = 0

x+9 = 0 // - 9

x = -9

x in (-oo:-9) U (-9:+oo)

7/(x+9) = 21/36 // - 21/36

7/(x+9)-(21/36) = 0

7/(x+9)-7/12 = 0

(7*12)/(12*(x+9))+(-7*(x+9))/(12*(x+9)) = 0

7*12-7*(x+9) = 0

21-7*x = 0

(21-7*x)/(12*(x+9)) = 0

(21-7*x)/(12*(x+9)) = 0 // * 12*(x+9)

21-7*x = 0

21-7*x = 0 // - 21

-7*x = -21 // : -7

x = -21/(-7)

x = 3

x = 3

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