-12=r/2

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Solution for -12=r/2 equation: 


r in (-oo:+oo)

-12 = r/2 // - r/2

-(r/2)-12 = 0

-1/2*r-12 = 0 // + 12

-1/2*r = 12 // : -1/2

r = 12/(-1/2)

r = -24

r = -24

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