(5r+15)/20=(5r-15)/5

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Solution for (5r+15)/20=(5r-15)/5 equation: 


r in (-oo:+oo)

(5*r+15)/20 = (5*r-15)/5 // - (5*r-15)/5

(5*r+15)/20-((5*r-15)/5) = 0

(5*r+15)/20+(-1*(5*r-15))/5 = 0

(5*(5*r+15))/(5*20)+(-1*20*(5*r-15))/(5*20) = 0

5*(5*r+15)-1*20*(5*r-15) = 0

375-75*r = 0

(375-75*r)/(5*20) = 0

(375-75*r)/(5*20) = 0 // * 5*20

375-75*r = 0

375-75*r = 0 // - 375

-75*r = -375 // : -75

r = -375/(-75)

r = 5

r = 5

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