13=r/7

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Solution for 13=r/7 equation: 


r in (-oo:+oo)

13 = r/7 // - r/7

13-(r/7) = 0

13-1/7*r = 0 // - 13

-1/7*r = -13 // : -1/7

r = -13/(-1/7)

r = 91

r = 91

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