7=-(2)/(u+3)

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Solution for 7=-(2)/(u+3) equation: 


D( u )

u+3 = 0

u+3 = 0

u+3 = 0

u+3 = 0 // - 3

u = -3

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

7 = -(2/(u+3)) // + 2/(u+3)

2/(u+3)+7 = 0

2/(u+3)+(7*(u+3))/(u+3) = 0

7*(u+3)+2 = 0

7*u+23 = 0

(7*u+23)/(u+3) = 0

(7*u+23)/(u+3) = 0 // * u+3

7*u+23 = 0

7*u+23 = 0 // - 23

7*u = -23 // : 7

u = -23/7

u = -23/7

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