4/5r-1=5r

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Solution for 4/5r-1=5r equation: 


r in (-oo:+oo)

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

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

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

-21/5*r-1 = 0 // + 1

-21/5*r = 1 // : -21/5

r = 1/(-21/5)

r = -5/21

r = -5/21

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