(5r+10)/8=(5r-1)/9

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Solution for (5r+10)/8=(5r-1)/9 equation: 


r in (-oo:+oo)

(5*r+10)/8 = (5*r-1)/9 // - (5*r-1)/9

(5*r+10)/8-((5*r-1)/9) = 0

(5*r+10)/8+(-1*(5*r-1))/9 = 0

(9*(5*r+10))/(8*9)+(-1*8*(5*r-1))/(8*9) = 0

9*(5*r+10)-1*8*(5*r-1) = 0

5*r+98 = 0

(5*r+98)/(8*9) = 0

(5*r+98)/(8*9) = 0 // * 8*9

5*r+98 = 0

5*r+98 = 0 // - 98

5*r = -98 // : 5

r = -98/5

r = -98/5

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