(7)/(y+7)=(9)/(y)

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Solution for (7)/(y+7)=(9)/(y) equation: 


D( y )

y+7 = 0

y = 0

y+7 = 0

y+7 = 0

y+7 = 0 // - 7

y = -7

y = 0

y = 0

y in (-oo:-7) U (-7:0) U (0:+oo)

7/(y+7) = 9/y // - 9/y

7/(y+7)-(9/y) = 0

7/(y+7)-9*y^-1 = 0

7/(y+7)-9/y = 0

(7*y)/(y*(y+7))+(-9*(y+7))/(y*(y+7)) = 0

7*y-9*(y+7) = 0

-2*y-63 = 0

(-2*y-63)/(y*(y+7)) = 0

(-2*y-63)/(y*(y+7)) = 0 // * y*(y+7)

-2*y-63 = 0

-2*y-63 = 0 // + 63

-2*y = 63 // : -2

y = 63/(-2)

y = -63/2

y = -63/2

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