13=r/2

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Solution for 13=r/2 equation: 


r in (-oo:+oo)

13 = r/2 // - r/2

13-(r/2) = 0

13-1/2*r = 0 // - 13

-1/2*r = -13 // : -1/2

r = -13/(-1/2)

r = 26

r = 26

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