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

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


r in (-oo:+oo)

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

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

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

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

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

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

-10*r-4-1 = 0

-10*r-5 = 0

(-10*r-5)/5 = 0

(-10*r-5)/5 = 0 // * 5

-10*r-5 = 0

-10*r-5 = 0 // + 5

-10*r = 5 // : -10

r = 5/(-10)

r = -1/2

r = -1/2

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