(2r-2)/(3r+1)=8

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Solution for (2r-2)/(3r+1)=8 equation: 


D( r )

3*r+1 = 0

3*r+1 = 0

3*r+1 = 0

3*r+1 = 0 // - 1

3*r = -1 // : 3

r = -1/3

r in (-oo:-1/3) U (-1/3:+oo)

(2*r-2)/(3*r+1) = 8 // - 8

(2*r-2)/(3*r+1)-8 = 0

(2*r-2)/(3*r+1)+(-8*(3*r+1))/(3*r+1) = 0

2*r-8*(3*r+1)-2 = 0

-22*r-10 = 0

(-22*r-10)/(3*r+1) = 0

(-22*r-10)/(3*r+1) = 0 // * 3*r+1

-22*r-10 = 0

-22*r-10 = 0 // + 10

-22*r = 10 // : -22

r = 10/(-22)

r = -5/11

r = -5/11

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