(r-3)/10=r/13

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Solution for (r-3)/10=r/13 equation: 


r in (-oo:+oo)

(r-3)/10 = r/13 // - r/13

(r-3)/10-(r/13) = 0

(r-3)/10-r/13 = 0

(13*(r-3))/(10*13)+(10*(-r))/(10*13) = 0

13*(r-3)+10*(-r) = 0

3*r-39 = 0

(3*r-39)/(10*13) = 0

(3*r-39)/(10*13) = 0 // * 10*13

3*r-39 = 0

3*r-39 = 0 // + 39

3*r = 39 // : 3

r = 39/3

r = 13

r = 13

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