12/(x+7)=9/5

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Solution for 12/(x+7)=9/5 equation: 


D( x )

x+7 = 0

x+7 = 0

x+7 = 0

x+7 = 0 // - 7

x = -7

x in (-oo:-7) U (-7:+oo)

12/(x+7) = 9/5 // - 9/5

12/(x+7)-(9/5) = 0

12/(x+7)-9/5 = 0

(5*12)/(5*(x+7))+(-9*(x+7))/(5*(x+7)) = 0

5*12-9*(x+7) = 0

-9*x-3 = 0

(-9*x-3)/(5*(x+7)) = 0

(-9*x-3)/(5*(x+7)) = 0 // * 5*(x+7)

-9*x-3 = 0

-9*x-3 = 0 // + 3

-9*x = 3 // : -9

x = 3/(-9)

x = -1/3

x = -1/3

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