-r/2=13

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Solution for -r/2=13 equation: 


r in (-oo:+oo)

-r/2 = 13 // - 13

-r/2-13 = 0

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

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

r = 13/(-1/2)

r = -26

r = -26

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