13=r/9

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Solution for 13=r/9 equation: 


r in (-oo:+oo)

13 = r/9 // - r/9

13-(r/9) = 0

13-1/9*r = 0 // - 13

-1/9*r = -13 // : -1/9

r = -13/(-1/9)

r = 117

r = 117

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