(-6/(u+7))=7

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Solution for (-6/(u+7))=7 equation: 


D( u )

u+7 = 0

u+7 = 0

u+7 = 0

u+7 = 0 // - 7

u = -7

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

-6/(u+7) = 7 // - 7

-6/(u+7)-7 = 0

(-7*(u+7))/(u+7)-6/(u+7) = 0

-7*(u+7)-6 = 0

-7*u-55 = 0

(-7*u-55)/(u+7) = 0

(-7*u-55)/(u+7) = 0 // * u+7

-7*u-55 = 0

-7*u-55 = 0 // + 55

-7*u = 55 // : -7

u = 55/(-7)

u = -55/7

u = -55/7

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