((4r+8)/12)=((5r-10)/5)

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Solution for ((4r+8)/12)=((5r-10)/5) equation: 


r in (-oo:+oo)

(4*r+8)/12 = (5*r-10)/5 // - (5*r-10)/5

(4*r+8)/12-((5*r-10)/5) = 0

(4*r+8)/12+(-1*(5*r-10))/5 = 0

(5*(4*r+8))/(5*12)+(-1*12*(5*r-10))/(5*12) = 0

5*(4*r+8)-1*12*(5*r-10) = 0

160-40*r = 0

(160-40*r)/(5*12) = 0

(160-40*r)/(5*12) = 0 // * 5*12

160-40*r = 0

160-40*r = 0 // - 160

-40*r = -160 // : -40

r = -160/(-40)

r = 4

r = 4

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