(2/5)(r+1)=(4/5)-r

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Solution for (2/5)(r+1)=(4/5)-r equation: 


r in (-oo:+oo)

(2/5)*(r+1) = 4/5-r // - 4/5-r

(2/5)*(r+1)+r-(4/5) = 0

(2/5)*(r+1)+r-4/5 = 0

2/5*(r+1)+r-4/5 = 0

(2/5*5*(r+1))/5+(5*r)/5-4/5 = 0

2/5*5*(r+1)+5*r-4 = 0

7*r-4+2 = 0

7*r-2 = 0

(7*r-2)/5 = 0

(7*r-2)/5 = 0 // * 5

7*r-2 = 0

7*r-2 = 0 // + 2

7*r = 2 // : 7

r = 2/7

r = 2/7

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