((5r+60)/20)=((3r-9)/3)

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Solution for ((5r+60)/20)=((3r-9)/3) equation: 


r in (-oo:+oo)

(5*r+60)/20 = (3*r-9)/3 // - (3*r-9)/3

(5*r+60)/20-((3*r-9)/3) = 0

(5*r+60)/20+(-1*(3*r-9))/3 = 0

(3*(5*r+60))/(3*20)+(-1*20*(3*r-9))/(3*20) = 0

3*(5*r+60)-1*20*(3*r-9) = 0

360-45*r = 0

(360-45*r)/(3*20) = 0

(360-45*r)/(3*20) = 0 // * 3*20

360-45*r = 0

360-45*r = 0 // - 360

-45*r = -360 // : -45

r = -360/(-45)

r = 8

r = 8

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