9=r/13

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Solution for 9=r/13 equation: 


r in (-oo:+oo)

9 = r/13 // - r/13

9-(r/13) = 0

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

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

r = -9/(-1/13)

r = 117

r = 117

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