7/(u+1)=4/(u+4)

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Solution for 7/(u+1)=4/(u+4) equation: 


D( u )

u+1 = 0

u+4 = 0

u+1 = 0

u+1 = 0

u+1 = 0 // - 1

u = -1

u+4 = 0

u+4 = 0

u+4 = 0 // - 4

u = -4

u in (-oo:-4) U (-4:-1) U (-1:+oo)

7/(u+1) = 4/(u+4) // - 4/(u+4)

7/(u+1)-(4/(u+4)) = 0

7/(u+1)-4*(u+4)^-1 = 0

7/(u+1)-4/(u+4) = 0

(7*(u+4))/((u+1)*(u+4))+(-4*(u+1))/((u+1)*(u+4)) = 0

7*(u+4)-4*(u+1) = 0

3*u+24 = 0

(3*u+24)/((u+1)*(u+4)) = 0

(3*u+24)/((u+1)*(u+4)) = 0 // * (u+1)*(u+4)

3*u+24 = 0

3*u+24 = 0 // - 24

3*u = -24 // : 3

u = -24/3

u = -8

u = -8

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